MXPA99003772A - Optical disc - Google Patents

Abstract

The tracks in a read-only area are divided into sector regions having the same capacity, error correcting codes are added to 1st data signals to generate 2nd data signals and pit rows are formed in the sector regions to record data. In a rewritable area, recorded user data are correlated with 1st data, the same error correction codes used for the read-only area are added to the 1st data signals to generate 2nd data signals in a similar way and data signals for making rewritable are added to the 2nd data signals to generate 3rd data signals. A format is set up by adding a header region where sector address information is recorded to a region in which the 3rd data signals are recorded. The region is divided into two areas radially, the outer area being made a rewritable area and the inner area being made a read-only area. Control data signals are recorded in the read-only area.

Description

OPTICAL DISC DESCRIPTION Background and field of the invention The present invention relates to an optical disk and more particularly relates to a rewritable optical disk having a control data signal representing the type of disk and other data. In recent years, the use of different types of optical discs has been extended, for example, read-only types such as a CD and a CD-ROM and types that allow the recording of data such as a type of data addition and a rewritable type. Some of these optical discs of the read-only type, the type of data addition, and the rewritable type are the same in appearance and other characteristics, although they are different in type. Some of the optical discs are different from each other in the type of format and in parameters to be set in recording or playback. The information in the type of format and the information to establish -parameters are therefore pre-recorded as control data signals in a predetermined region of the disk.-These control data signals are required to be read by a controller device for playing / recording data from / on the optical disk before different settings are made for the controlling device. A method for recording such control data signals using a "130 mm rewritable optical disk" will be described as an example. The "rewritable 130 mm optical disk" has a format defined by JIS X6271. There are two types of formats: format A in which spiral grooves are formed on the disc and ridges between adjacent grooves are used as tracks to record signals; and format B in which marks are formed for tests on a disk to allow control of the tracking by means of a servo test method. The two formats are common in the configuration of a control information track where the control data signals are recorded. That is, the control information track is specified to have a PEP region, an internal SFP region, and an external SFP region. The PEP region is located on the inner part of the disk, where previously recorded marks (also called holes or depressions recorded) are used, obtained by modulation with recording codes modulated in phase and low frequency. All brands in the PEP region are placed in a way that find aligned in the radial direction of the disc. This arrangement is shown schematically in Figure 3a. Each previously recorded or pre-recorded mark and each space between previously recorded marks are two channel length bits. A PEP bit cell has a length of 656 + 1 channel bit. Referring now to Figure 4, the information of the PEP bit cell is represented by means of a phase-modulated recording code. A PEP bit cell in which marks were formed in the first half of it represents logic 0, whereas where marks were formed in the second half of it represents logic 1. A total of 561 to 567 cells were recorded WBS bit per track on the disk. The PEP region has a track format shown in Figure 5A, which includes three sectors 177. Figure 5B shows a sector format of each sector. The numbers shown in the figures represent the numbers of PEP bit cells assigned to respective signals. A data region of the sector format where several control signals were recorded has a capacity of 18 bytes (144 PEP bits). For example, a signal representing the format (format A or B) to be used by the disk is recorded in byte 0. The details in other control signals to be recorded in the data region are specified in the aforementioned JIS standard. So its description is omitted here. When the previous PEP region is illuminated with light with an optical head or something similar, the light is focused on a recorded signal surface of the disc by focusing control. Since the marks are aligned in the radial direction in the PEP region, signals can be reproduced without tracking control. Figure 3A shows an example of a beam track. The part where marks are not formed serves as a mirror, producing a large amount of reflection light. The part where marks are formed differs reflection light depending on whether the marks exist or not in respective positions on the disc. Therefore, the average level of the amount of reflection light is low compared to that of the mirror part. Figure 3B shows a change in the amount of reflection light. Since the repetition frequency of the marks is greater than the period of the PEP bit cells, the components of the mark signal can be eliminated by limiting the band during a reproduction signal. The waveform of the reproduction signal obtained by the band limit is shown in Figure 3C. The information of each PEP bit can be detected by comparing the level of the reproduction signal.

Next, the internal and external SFP regions will be described. The same information is recorded in the internal and external SFP regions. Brands are pre-recorded in the internal and external SFP regions under a standard-user data format. A region of 512 B is assigned to the control data signals. For example, the same information as the 18 B information recorded in the PEP regions is recorded in bytes 0 through 17. Details about other control information to be recorded in this region are specified in the aforementioned JIS standard. Therefore, its description is omitted here. Figure 6 shows a standard user data format where the user data capacity is 512 B and format A is used. The numbers shown in this figure represent the number of bytes (B) assigned to respective signals. The capacity of the region becomes 650 B including an error correction code, resynchronism bytes and control bytes in addition to user bytes of 512 B. This sector for recording signals in the data region also includes the following regions: a section of pre-recorded direction composed of a sector mark (SM) indicating the head of the sector, a VFO region to synchronize the clock reproduction, a region ID indicating the direction of the sector, an address mark (AML) which indicates the head of the ID region and other similar regions and regions for rewriting data, such as a deviation detection region (ODF), an ~ ALPC used for laser output detection and a buffer region provided to avoid overlapping with a subsequent sector. The total capacity of the sector is therefore 746 B. Although the control data recorded in the SFP regions are pre-recorded marks, the capacity of 746 B is also required to record the control signals of 512 B, since the control data is they record under the user data format. Recently, read-only optical discs have been proposed in which digitized and compressed image and sound signals are recorded. Figures 7A to 7C show an example of a sector format of one such read-only optical discs proposed as a DVD. A 2048 B unit of data such as image and sound is recorded in a sector, this unit is called a first data signal, the sector also includes a 4 B data ID indicating an address such as a number. sector, an IED of 2 B for the detection of error of the ID data, a REV of 6 B as a reserve, and a 4 B EDC for error detection of the sector as a whole. regions is called a first data unit. Figure 7A shows a configuration of the first data unit which has a data length of 204B T 4 4-2 6 + 4 = 2064 (B). The information data (2048 B) is encoded as follows. A change record is constructed in such a way that the so-called M-series data are generated. An initial value is established for the change record and it is changed sequentially in synchronism with the data, in order to generate pseudoaleatope data. An exclusive-OR between the generated pseudoaleatopos data and the information data to be recorded is calculated each bit. Thus, the information data is coded (2048 B). A total of 16 sectors of the first data units coded so as to constitute an error security code of the main Solomon coding are placed in conpoint. In such error correction code, each data unit constituting a sector is arranged in an array of 172 B X 12 rows and a total of 16 sectors of such data units are placed together to constitute an array of 172 B X 192 rows. An external code of 16 B is added to each column of the array, and then an internal code of 10 B is added to each row of the resulting array. As a result, a data block of 182 B X 208 rows (37856) is formed.

This block of data is called ECC block. This configuration is shown in Figure 7B. Subsequently, the ECC block is interleaved so that the 16 B external codes are included in the respective sectors. Thus, the data capacity of each sector becomes 182 B X 13 rows = 2366 B. The resulting data is then modulated with a recording code. An RLL code where the run length after modulation is limited, is used as the recording code. As an example, an 8/16 conversion code is used which converts 8-bit data into 16-bit channel data. This conversion is made based on a predetermined conversion table. The DC components included in the recording code can be suppressed by controlling the code selection, although the detailed description of this control is omitted here. At this time, the minimum and maximum bit lengths are limited to 3 and 11 channel bits, respectively. In order to ensure synchronism during playback, a synchronization code is inserted. A sync code of 2 B is inserted every 91 B, that is, half of a row gives 182 B. Like the synchronization code, many and varied codes with a length of 32 bits of channel are predetermined having patterns which normally do not appear in conversion code 8/16. This data period of 93 B including the synchronization code is called a frame. This configuration is shown in Figure 7C. Thus, the data capacity of each sector is now 186 BX 13 rows = 2418 B. On a read-only DVD that has a recording surface of the signal, the data is recorded by the formation of holes on the disc from the internal circumference of the same to the outer circumference at a constant linear velocity (ie, _ by handling CLV) according to the sector format described above. A disc having double signal recording surfaces has also been proposed, although the description thereof is omitted here. Figure 8 shows an array of signal recording areas of the read-only DVD. An initial area is located on the innermost part of the disk, which starts at a radius of 22.6 mm. The data area where information data is recorded such as image and sound, starts at a radius of 24.0 mm and ends at Tin maximum radius of 58.0 mu. The data area is followed by a final area. The maximum radius of the final area is 58.5"mm The deselect address is 30000 in hexadecimal notation (indicated as 30000h) at the head of the data area and is increased by lh each sector towards the outer circumference of the disk. In the initial area, the sector direction decreases in lh each sector towards the internal circumference of the disk. The control information such as the control data is recorded in the initial area under the sector format described above. In the initial area, a reference code is recorded in two ECC blocks that cover sector addresses that start from 02F000h to 0F020h. The reference code is used for identification of the disc manufacturer, setting and the like. The control data is recorded on 192 blocks covering sector addresses from 02F200h to 02FE00h. "In the other sectors, in the initial area, the information data is recorded as OOh under the same sector format as described above, a rewritable DVD has been proposed which is compatible in format with the read-only DVD described above. In such a rewritable optical disk, concentric or spiral grooves are formed on a disc substrate, and a recording film is formed on the substrate to define tracks along the grooves.To increase the recording capacity, both grooves and crests between adjacent grooves are used to eat recording tracks.

Each track is divided into a plurality of sectors as units for recording and reproducing data. The address information is added to each sector so that the position of the required information data can be managed to facilitate high-speed data recovery. A header region J is provided which includes an ID signal representing the sector address information, at the head of the sector. To ensure compatibility with the read-only DVD, the rewritable DVD is formatted so that the 2418 B data of a read-only DVD sector can be recorded in a region of user data from a rewritable DVD sector. a unit. This data is called a second data signal. The sector format for the rewritable DVD also requires a region ID that indicated the sector address number and a buffer region, as in the case of the optical disc in accordance with the JIS standard mentioned above. The capacity of the entire sector including these regions is preferably a multiple of the frame length (93 B) of the format for the read-only disk. Figure 9 shows an example of the format for the rewritable DVD which meets the requirements previous The data of 2048 B (first data signal) is arranged in a format similar to that used for the read-only DVD described above, to obtain data of 2418 B (second data signal) and the resulting data of 2418 B-recorded in a data region 91 of the sector schematic distribution shown in Figure 9. The B B post region 92 follows the data region 91. In the case of the conversion code 8/16 described above, the end of the Recording code must be identified so that the converted data can be deciphered correctly. A pattern or model obtained by modulating a predetermined code according to a modulation rule is recorded. A PS 93 region precedes the data region, where a presynchronism signal is recorded to indicate the start of the data region and obtain the byte synchronization. As the presynchronism signal, a code with a length of 3 B (48 bits of channel) having "high autocorrelation is predetermined." A VFO region precedes the PS 93 region. The VFO 94 region is a region where a signal is recorded. with a specific pattern to obtain fast and stable synchronization of a PLL of a reproduction circuit.

The specific pattern of the signal is, for example, a repetition of a 4-bit channel pattern, that is, "" .... 1000 1000 .... "as represented in the coding NRZI The length of the VFO 94 region is 35 B to ensure the frequency of the inversion and the duration required for stable synchronization. A first security data region 95 precedes the VFO region 94, while a second security data region 96 follows the PA region 92. In a rewritable recording medium, the start and end portion portions of the area Recording are degraded after repeated recording and erasing operations. The security data regions are therefore required to have a length sufficiently long to prevent degradation from affecting the area of the VFO region for the PA region. It has been found from experiments that the lengths of the first and second safety data regions should be 15 B and 45 B respectively. The data to be recorded in these safety data regions are, for example, the same repeat of the 4-bit channel pattern as that used for the VFO region, ie, • 1000 1000 An empty region is provided 97 to adjust a laser power. The length of the empty region 97 is 10 B to ensure the time required to adjust the laser power. An intermediate buffer region 98 is provided to ensure a time width where data is not recorded to ensure that the The end of the data region does not overlap with a subsequent sector even if a variation ~ occurs in the disk motor spin or eccentricity of the disk. The length of the buffer region 98 is 40 B. The top region constitutes an area where the rewritable data is recorded and has a total length of 2567 B. The signal recorded in this area is referred to as a third data signal. A mirror region 99 has a length of 2 B to ensure the time required to determine a deviation of the servo tracking. Next, a heading region will be described. As shown in Fig. 9, a first half 19 and a second half 20 of the heading region, with respect to the centerline of the groove in the radial directions, are displaced by about a quarter of the pitch of the groove so that the The header region can be read from both the track track and the track track. The first half 19 and the second half 20 move in opposite directions to each other with respect to the center line of the groove. With reference to Figure 9, the header region includes four sector ID signals (PIDs). For the groove track, for example, PID1 and PID2 in the first half move towards the outer circumference of the disk, while PID3 and PID4 in the second half move towards the internal circumference of the disk. A PID region of 4 B representing the sector address information is provided in each PID of sector ID signal. In the Pid region, 3 B are located for the sector number and the remaining 1 byte is assigned to various types of information such as the PID number. In a Pid3 region 113 and a Pid4lia region, the address information of the sector of the furrow track having the center line from which the PIDs are moved is recorded. In a Pidl region 103 and a Pid2 region 108, the sector address information in the crest track which is on the outer side of the adjacent groove track is recorded. The IED regions 104, 109, 114 and 119 with a length of 2 B represent an error detection code for the respective preceding Pid regions. The data in the Pid regions and the IED regions are modulated with the conversion code 8/16 described above. To identify the end of the conversion code, post-bulb regions (PA) of 1B 105, 110, 115 and 120 are provided. The regions AM 102, 107, 112 and 117 precede the respective regions Pid, where marking signals are recorded. of address to indicate the beginning of the regions Ask and get byte sync. Each address marking signal has a length of 3 B (48 channel bits) and a code that has a pattern which does not appear in the conversion code 8/16 is predetermined. The VFO regions are provided at the heads of the respective sector ID signal PIDs. As in the aforementioned VFO region, the repetition of the 4-bit channel pattern is used, * .... 1000 1000 .... "As described above, in the header region, the first half PID1 and PID2 and the second half PXD3 and PID4 move in opposite radial directions Thus, in order to resume bit synchronization, the first VFO regions 101 and 111 located in the heads of the first and second halves of the header region become long. In contrast, the second VFO regions 106 and 116 of the first and second halves may be short since they are only required to resynchronize, for example, the lengths of the first and second VFO regions are 36 B and 8 B, respectively. As a result, the total length of a sector of the rewritable DVD is 2697 B. Thus, the length of a sector of the rewritable DVD is longer than that of a sector of the read-only DVD at 279 B (corresponding to three frames).

As described above, in the rewritable DVD, as in the read-only DVD, it is necessary to pre-record the control data signals indicating various types of control information. This can be done using the prerecorded marks, as in the case of the previously described "130 mm rewritable optical disc", under the sector format used for the "130 mm rewritable optical disc". The length of a sector of the rewritable DVD is greater than that of a sector of the read-only DVD at approximately 10% or more as described above. Since the control data signals are recorded during the manufacturing of the disc and do not need to be rewritten, this increase in the sector length is unnecessary for the recording of the control data signals. This unnecessary increase in the length of sector is therefore a disadvantage for DVDs which are required to have a large capacity.

A driver device for DVDs that is capable of recording or reproducing both read-only and rewritable DVDs is required. However, read-only DVDs and rewritable DVDs are different in industry format. The type of the disk can be identified by reading the control data signal. However, to read the control data signal, the disc format must be identified to locate the recorded position of the control data signal. To identify the type of disc, a region with the same sector format can be established both for the read-only type co- or for the rewritable type, using previously recorded marks to record a signal indicating the type of disk in the region, as in the case of the PEP region of the "130 mm rewritable optical disk" described above. This common region is reproduced first during disk activation to identify the type of disk. Once the disk type has been identified, the control data on the disk can be played according to the format for the disk. However, as in the case of the "130 mm rewritable optical disc", the signal indicating the type of disc recorded in the common area is the signal recorded as part of the control data signal. Recording the same control data signal in two different regions results in redundancy of the recording area. The redundancy of the recording area is a disadvantage for DVDs which are required to have a large capacity. Taking the foregoing into consideration, the object of the present invention is to provide an optical disk in which control data signals are recorded in a format which can be easily read independently of the type of optical disc, a read-only DVD or a rewritable DVD and where the redundancy is reduced to improve the recording capacity. The optical disc of the present invention includes a read-only area in which a plurality of read-only tracks and a rewritable area are formed in which a plurality of rewritable tracks are formed, wherein each of the plurality of tracks of read-only is divided into a plurality of first sectors, a signal is pre-recorded in at least one of the plurality of first sectors under a predetermined reproduction format, each of the plurality of rewritable tracks is divided into a plurality of second sectors, a signal is recorded in at least one of the plurality of second sectors under a predetermined recording format including the predetermined reproduction format and the read-only area is located on an inner portion of the optical disk, while the rewritable area is it is located on the external part of the optical disc, with which the previous objective is achieved. Each of the plurality of first sectors can be aligned in a radial direction of the optical disk. An array of holes can be formed in the read-only area, concentric grooves or- spirals in the rewritable area and the depth of the hole arrangement can be practically the same as the depth of the grooves. A reference signal for reproduction adjustment can be pre-recorded in the first sectors of the number equal to a multiple of the number of first sectors included in an error correction block and the first sectors where the reference signal can be pre-recorded are located within a cycle of the read-only track. The rewritable area may include a data area where user data is recordable, the data area includes an initial area having a zone for test recording and a final area having a zone for test recording, and the initial area may located on an internal side of the data area and the final area can be located on an external side of the data area. The optical disk of the present invention includes a read-only area in which a plurality of read-only tracks and a rewritable area are formed in which a plurality of rewritable tracks are formed, wherein each of the read-only tracks is divided into a plurality of first sectors, a signal is pre-recorded in at least one of the plurality of first sectors under a predetermined reproduction format, each one of the plurality of rewritable tracks is divided into a plurality of second sectors, a signal is recordable in at least one of the plurality of second sectors under a predetermined recording format that includes the predetermined playback format, the read-only area is located in an internal part of the optical disc, insofar as the rewritable area is located on an external part of the optical disc and a connection zone is provided between the read-only area and the rewritable area, nor the signal under the predetermined reproduction format nor the signal under the predetermined recording format is recorded in the connection area, whereby the previous objective is achieved. The width of the connection area in the radial direction can be set smaller than an amount of eccentricity of the optical disc. An address increased by an address from a direction of a last sector in the read-only area may be used as an address of a header sector in the rewritable area. The optical disk of the present invention is compatible with a read-only optical disk which includes a read-only area having a plurality of read-only tracks, each of the plurality of read-only tracks being divided into a plurality of read-only tracks. first sectors, with signals being prerecorded in at least one of the plurality of first sectors under a predetermined reproduction format, the optical disc includes a read-only area in which a plurality of read-only tracks and a rewritable area are formed in which a plurality of rewritable tracks are formed, wherein each of the plurality of tracks alone reading is divided into a plurality of first sectors, a signal is pre-recorded in at least one of the plurality of first sectors under a predetermined reproduction format, each of the plurality of rewritable tracks is divided into a plurality of second sectors, one signal is recordable in at least one of the plurality of second sectors under a predetermined recording format, including the predetermined reproduction format and the read-only area is located in an internal part of the optical disc, while the rewritable area is it locates in an external part of the optical disc, with which the previous objective is achieved. An ads of a sector for recording a control data signal may be the same as a sector ads for recording a read-only optical disk control data signal.

An address of a header sector in the rewritable area may be the same as an address of a header sector in a data area of the optical-read-only disk. A radial position of a header sector in the rewritable area may be the same as "a radial position of a header sector in an area of the read-only optical disk." A logical address of a sector in a data area of the rewritable area. can be obtained by adding a logical address to a physical address of a header sector in the data area A logical address of a header sector in a data area of the rewritable area can be the same as an address of a header sector in a data area of the read-only optical disk In accordance with one aspect of the present invention, the optical disk includes a read-only area in which a plurality of read-only tracks and a rewritable area are formed in which forms a plurality of rewritable tracks Each of the plurality of read-only tracks is divided into a plurality of first sectors. a signal in at least one of the plurality of first sectors under a default playback format. Each of the plurality of rewritable tracks is divided into a plurality of second sectors. A signal is recordable in at least one of the plurality of second sectors under a predetermined recording format that includes the predetermined reproduction format. The read-only area is located on an internal part of the optical disk, while the rewritable area is located on an external part of the optical disk. Accordingly, a control data signal may be recorded in the read-only area where a region for recording header information is not provided. This means that the control data signal is recorded under a reproduction format for the first sectors in the read-only area that is smaller in redundancy than the sector format for the second sectors in the rewritable area. This improves the efficiency of the rewritable optical disk recording region. According to another aspect of the present invention, the optical disk is compatible with a read-only optical disk and includes a read-only area in which it is formed. a plurality of read-only tracks and a rewritable area in which a plurality of rewritable tracks are formed. Each of the plurality of tracks Read only is divided into a plurality of first sectors. A signal is pre-recorded in at least one of the plurality of first sectors under a predetermined reproduction format. Each of the plurality of rewritable tracks is divided into a plurality of second sectors. A signal is recordable in at least one of the plurality of second sectors under a predetermined recording format that includes the predetermined reproduction format. The read-only area is located on an internal part of the optical disk, while the rewritable area is located on an external part of the optical disk. Therefore, the control data signal is recorded in the read-only area located on the inner part of the optical disk, as in the case of the read-only disk, under the same sector format as that used for the optical disk of the optical disk. read only. As a result, a driver device which is compatible with both the rewritable optical disk and the read-only optical disk can reproduce data from any optical disk mounted on the controller device, the rewritable optical disk or the optical disk-read-only , under the same sector format. The controlling device can detect the control signals recorded on both types of discs optics and activate these optical discs easily. This eliminates the need to provide a special region such as the PEP region described above.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view of a schematic distribution of areas of an example in accordance with the present invention. Figure 2 is a schematic view of the appearance of an optical disk of the example according to the present invention. Figures 3A, 3B and 3C are schematic views of an array of marks in a PEP region of a conventional example, Figure 4 is a schematic view of cell shapes of bit cells in the PEP region of the conventional example. 5A and 5B are schematic views of formats of the PEP region of the conventional example, Figure 6 is a schematic view of a sector format of a conventional optical disk, Figures 7A, 7B and 7C are schematic views of sector formats of a read-only area of the example according to the present invention.

Figure 8 is a schematic view of a schematic layout of areas of a conventional read-only DVD. Figure 9 is a schematic view of a sector format of a rewritable area of the example according to the present invention. Figure 10 is a schematic view showing the boundary part between the rewritable area and the read-only area of the example in accordance with the present invention. In the following, the present invention will be described by way of example with reference to the accompanying drawings. As an example of the present invention, a rewritable DVD which is compatible in format with the conventional read-only DVD described above will be described. The appearance of the optical disc is shown in Figure 2. Figure 2 shows an optical disk 1, a central hole 2 and a rewritable area 3 for recording data. Spiral grooves are formed in the rewritable area 3 to record data and the grooves and ridges between adjacent grooves are used as tracks. A read-only area 4 is provided on the internal side of the rewritable area 3. In this example, a control data area is provided in the read-only area 4. where control data representing different types of detailed information on the disc are recorded. The sector format shown in figure 7 and described above is used for the read only area 4. That is to say a first data signal of 2048 B together with a data ID an error correction code, a code of synchronism to resynchronize and others constitute data with a sector length of 2418 B. The resulting data is pre-recorded on the disk as a hole array. The sector format shown in Figure 9 and described above is used for the rewritable area 3. That is, the user data is divided into units of 2048 B of first data signals. Each first data signal is transformed into a second 2418 B data signal having the same configuration as the format for the read-only area (Figure 7). The data required to provide the rewrite ability is added to the second data signal to obtain a third data signal of 2567 B. A space for recording this data size is ensured in a track and a 128 B header region and a mirror-region of 2 B are added to the third data signal, thus obtaining a region of rewritable sector with a total-length of 2697 B. This format is therefore a format wherein the 2418 B data of a sector of the read-only DVD can be recorded in the user data region of a rewritable DVD sector as a unit without change. To indicate the directional numbers of the sectors in the adjacent groove and ridge tracks, the first half 19 and the second half 20 of the heading region of the rewritable area are displaced with respect to the center line of the groove in the directions radials opposed to each other in about a quarter of the furrow pitch. To achieve the above arrangement, the header regions require to be aligned in the radial direction of the disk. This sector arrangement results in having the same number of sectors for all tracks including the internal and external tracks of the disk, which reduces the recording density of the external tracks. To overcome the above problem, the rewritable area is divided into a plurality of zones. The number of sectors per track is the same within each zone and increases in a sector as the zones approach the outer circumference of the disk from its inner circumference.

For example, when recording data in a phase change recording material under the format shown in Figure 9 using a semiconductor laser with a wavelength of 650 nm and a target lens with 5 NA of 0.6, the length is achieved minimum bit of approximately 0.41 μm. If the radial position of the innermost end of the rewritable area is set to 24.0 mm which is practically the same as the radial position of the innermost end of the data area of the single disc reading, 17 sectors can be formed on each track in the innermost zone. Increasing the number of sectors per track by a sector for each zone while maintaining the minimum bit length practically, a total of 24 zones are obtained for a disk with a radius of 12 cm, and 40 sectors are formed on each track in the outermost zone. In this case, the total user data capacity of all zones is approximately 2.6 GB. When data is recorded on or reproduced from the disk with the previous sector arrangement, it can be used The following methods of control are: an MCAV control method in which, while rotating the disc at a constant rotational speed, the frequency of recording / repeating changes each zone; and "n ZCLV control method in the which the rotational speed is changed each zone so that the linear velocity is practically the between the zones, while the speed of rotation is fixed within each zone. In the following, a mastering process will be described to manufacture the disc with the previous format. The mastering includes recording signals according to the format using a light source with a short wavelength such as a laser gas at the same time that a glass plate is rotated to which a photosensitive agent (protective layer) is applied. An EO modulator or something similar is irradiated with laser light from the light source. When electrical signals in accordance with the format described above are applied to the EO modulator, the intensity of the light passing through the EO modulator is modulated. The modulated light is focused with the objective lens on the glass plate to illuminate the photosensitive agent. Through the development of the glass plate, pre-recorded holes and grooves are formed on the glass plate. A metal mask is formed by metallic coating using the plate as an original disc of protective layer. A resin disc substrate based on the metal matrix is then formed, the detailed description of which is omitted here. In this mastering process, a rotating table to rotate the glass plate is rotated with great precision. Therefore, it is used a rotating table with a large force of inertia - and thus, it is difficult to change the rotation speed instantaneously during mastering. In this example, as described above, the read-only area 4 is provided on the inner part of the disk as shown in figure 2. The same sector as that used for the read-only area 4 is used for the same area. the read-only DVD However, the read-only DVD is controlled by means of the CLV control method where the linear speed is constant as described above, while the rewritable DVD is controlled by the MCAV or ZCLV control method. If the different control methods for the read-only area and the rewritable area are used, switching of the rotational speed is required. Switching the rotational speed during mastering is difficult as described earlier. In this example, therefore, the data is recorded in the read-only area at a constant rate of disk rotation. The read-only area of the resulting disk is controlled by the same control method as that for the rewritable area, that is, the MCA or ZCLV control method. Since the sectors in the read-only area are arranged at speed_ constant, the period of reproduction of the sectors becomes constant. As a result, even if the direction of a sector fails to be reproduced, it can be easily incorporated from the positions of the preceding and following sectors. The thickness of the photosensitive agent applied to the glass plate in the asterization process becomes practically uniform. This thickness corresponds to the depth of the grooves in the rewritable area. For example, the depth of the slots in the rewritable area is determined to be optically approximately? / 8 to obtain a large tracking signal. In the read-only area, the depth of the grooves, which corresponds to the depth of the holes, is determined to be optically approximately? / 4 to obtain a great contrast- of reproduction signals. The depth of the holes in the read-only area is therefore greater than that of the grooves in the rewritable area - It is difficult to change the depth of the grooves and holes between the read-only area and the rewritable area of the same disc . In this example, therefore, the depth of the holes in the read-only area is practically the same as the depth of the grooves in the rewritable area.

More specifically, the depth of the holes in the read-only area becomes smaller than the depth of the holes in the read-only disk (optically about μ / 4). This causes a failure to obtain a large constant of the reproduction signals. To compensate for this, the length of the shortest hole becomes larger than that of the read-only disk. For example, the length of the shortest holes is 0.41 μm which is the same bit length as that used in the rewritable area. In this example, the sector format is different between the rewritable area and the read-only area. While the length of the sector is 2418 B in the area-read-only, this is 2697 B in the rewritable area. The innermost area of the rewritable area has 17 sectors per track as described above. The number of sectors per track in the read-only area when the minimum bit length is practically the same is calculated as follows. 17 x 2697/2418 = 18.! Taking into consideration the facts that the read-only area is located closer to the inner circumference of the disk than the rewritable area and that the number of sectors per track must be an integer, the number of sectors per track in the read-only area is determined to be _18 sectors as an integer that does not exceed the previous value. In this example, the track pitch is practically the same in the rewritable area and in the read-only area. Figure 10 shows schematically the tracks in the boundary between the rewritable area and the read-only area. Part (a) represents the read-only area and part (b) represents the rewritable area. In the read-only area, pre-recorded holes 11 are formed along each track 10. A track 12 is determined by the degree of crosstalk of the reproduction signals and the like. For example, the track pitch is 0.74 μm on the read-only DVD. In the rewritable area (b), grooves 14 are formed. The grooves are used as groove tracks 17 and the ridges between grooves are used as ridge tracks 18. A track 13, which is a gap between the track and The adjacent groove and the ridge track are substantially the same as the track passage in the read-only area. The furrow pitch is therefore twice the pitch of the track. The track widths of the furrow tracks and the crest tracks are practically the same. Therefore, the groove width and the track pitch are practically the same. To form wide grooves, the laser beam used to record data needs to be large in the radial direction in the mastering process described above. When such a wide beam is used to record in the read-only area, the resulting holes are large in width, thereby narrowing the gap between the holes in the adjacent track. This increases the crosstalk of the reproduction signals. To avoid this problem, two different laser light beams are used; one is used to record small holes in the read-only area and the other is wide to form grooves in the rewritable area. However, during the switching of laser beams for holes and for grooves in the boundary between the rewritable area and the read-only area, if the stain positions of the two laser beams on the disk surface deviate between each other, the engraved hole arrangement and the groove will not form in succession, but overlap each other or separate between them. It is quite difficult to place the stain positions of the two laser light beams in line with each other two-dimensionally on the disk surface. Therefore, it is impossible to connect the rewritable area and the read-only area with the same track pitch in its limits.

In the read-only area the hole array is recorded continuously starting from the innermost end of the area. At the outermost end of the read-only area, therefore, errors can accumulate, and thus the position of the end of the last sector can be changed. In this example, therefore, a connection zone is provided between the rewritable area and the read-only area. An example of such a connection zone is shown as part (c) in figure 10. This connection area of the first example constitutes a flat area (mirror) since signal recording is not required. The positioning of the two light beams is practically possible when the width of the connection zone is 1 μm or more. If the connection zone is wide, a tracking error signal is not generated when the connection zone is irradiated with laser light for servo tracking during the reproduction of data from the resulting disc with a controlling device. This makes the operation unstable. When a resulting disk is mounted on a controller device and rotated, more or less eccentricity occurs. If the size (width in the radial direction) of the mirror zone is smaller than the minimum amount of the eccentricity, the laser light beam from the controlling device it necessarily goes through the hole array in the read-only area or the groove in the rewritable area during a disk revolution. The tolerance on the amount of eccentricity of a normal disk is approximately + 50 μm maximum. Therefore, taking into consideration the minimum amount of the eccentricity, the width of the mirror zone in the radial direction can be about 5 μm. The mirror zone with this width corresponds to 2 to 8 tracks when calculated with the previous track step. In figure 10, virtual tracks 15. A second example of the connection area according to the present invention will be described. The first example of the connection zone constitutes a mirror zone as described above. In the second example of the connection area, fictitious data is recorded in the connection area. As fictitious data, the repetition of the 4-bit channel pattern, ".... 1000 1000 ....", used for the VFO region is used as shown in Figure 9. The fictitious data is formed along the tracks 15 shown in figure 10 covering from two to three tracks. Subsequently, one or two empty rows are recorded without heading regions (two to four tracks), followed by the formation of sectors with heading regions. With this configuration, even if the The stain positions of the laser light beams deviate from each other by approximately 1 μm, only the dummy data and the empty grooves overlap each other as described above, not destroying necessary data. By forming such a hole array, a tracking error in the connection zone is also detected in a stable manner. In a third example of the connection zone according to the present invention, the dummy data in the connection area has a sector configuration. For example, when fictitious data is recorded under the format for the read-only area, sectors are formed as shown in Figure 7 where the first user data is all OOh. When fictitious data is recorded under the format for the rewritable area, sector grooves are formed with the header regions as shown in Figure 9. With this configuration, as in the previous examples, even if the stain positions of the beams of laser light deviate from each other by approximately 1 μm, only the fictitious data sectors overlap each other, avoiding the destruction of necessary data. Even if part of a sector fails to read, no problems arise because these are fictitious data. It is possible to adjust so that the addresses of the sectors in the connection zone are not usable. Through the formation of such an industry arrangement, a tracking error in the connection zone is also detected in stable line. Even more, since the addresses of eector can be detected, the poems of the respective sectors on the disk are identified, thus facilitating the management of the system. Figure 1 shows a schematic distribution of the areas of the rewritable optical disk according to the present invention. Figure 1 is a lieta showing respective areas in the areas in order from the inner side to the outer side of the disc, together with the approximate radial position of each of the zones, the direction of the heading region of each zone, the number of blocks included in each zone the number of tracks in each area and the data ID number that indicates the logical data address. The sector address indicates the physical address of the sector, which is recorded in the Pid regions of the header region for each sector, in the rewritable area, and is recorded as the data ID number for each sector in the read-only area . The data ID number indicates the logical address of the data recorded in the sector. In the initial area and in the final area, the physical address and logical direction of each sector are the same. In each of the sectors rewritable in the initial and final area, the data ID number included in the rewritable data region (second data signal region) is the same as the physical address of the sector. The sectors in the data area are all rewritable sectors. The data ID number in each of these sectors indicates the logical direction of data recorded in the sector. With reference to Figure 1, the read-only area is located on the inner part of the disk. The innermost end of the read-only area is within a 22.6 mm radius of the disk, as in the case of the read-only DVD- The rewritable area starts at a radius of 24.00 mm from the disk, as in the case of the area data from the read-only DVD and expands towards the outer circumference of the disk. - The sector address is 30000 in the hexadecimal notation (denoted as 30000h) in the head of the rewritable area and increases in lh each sector towards the outer surface of the disk. In the read-only area, the sector address decreases in lh each sector towards the internal circumference of the disk. A part of the rewritable area on 256 ECC blocks (4096 sectors) from its head is used to test the disk and the device. controller and others. This part of the rewritable area is includes in the initial area which starts from the innermost end of the read-only area. The data area follows the initial area to perform the recording / playback of user data. The data area is divided into 24 zones from zone 0 to zone 23 as described above. The address of the header sector in the data area is 31000h. The final area follows the data area. In the following, the respective areas will be described in detail. In the part of the read-only area of the initial area, a reference signal area is provided for recording a reference code on an ECC block covering sector addresses starting from 2F000h to 2F010h. The reference code is used for identification of the manufacturer of the disc, setting and others. A control data zone is provided for recording control data signals over 192 blocks covering sector addresses starting from 2F00h to 2FE00h. The other parts of the read-only area constitute empty zones, where the first data signal is recorded as OOh in each sector under the same sector format as that used for the other parts. In this way, the same industry addresses are used as those used for the read-only DVD as described above for the control data zone. With this arrangement, it is possible for a diepoeitive controller compatible with these types of -discs to always look for the same sector addresses to reproduce the control data signals from the sectors of the same addresses. Therefore, such a controller device compatible with the two different types of disks can follow the same procedure to activate these disks. The connection zone follows the read-only area to obtain a smooth change from the read-only area to the rewritable area. As described above, in the first example of the connection zone, the _espe zone is provided over a corresponding part of two to eight tracks. Since no signals are recorded in the mirror zone, the last sector of the empty end area of the read-only area is the sector immediately before the sector address 30000h of the header sector in the rewritable area. The address of the last sector of the final empty zone is therefore 2FFFFh. The final empty zone includes 32 blocks that cover sector addresses from 2FE00h following the control data zone up to 2FFFFh.

In the second example of the connection zone, the connection zone includes fictitious data and empty rows that do not have sector addresses as described previously. Therefore, the address array can be used like that in the first example of the connection zone. In the third example of the connection zone, the fictitious data have a sector configuration. Therefore, the addresses of the sectors in the connection zone need to be present to be unusable. The connection zone preferably has. a January number of clues and corresponds to a whole number of blocks. For example, when the connection zone has eight tracks, it may correspond to new blocks. In this case, the number of blocks in the final empty area that precedes the connection zone is reduced by nine blocks to 23 blocks (sector addresses from 2FE00h to 2FF6Fh). The nine blocks are added to the connection zone, to add a region that covers sector addresses of 2FF70h haeta 2FFFFh for the connection zone. As a result, the connection zone is an area that covers sector addresses from 2FF70h to 30000h. Although no address was assigned for the first and second examples of the connection zones, it is possible to assign addresses to the connection zones which have no sector configuration, as in the case of the third example of the connection zone.

The part of the rewritable area located in the initial area follows the connection area. First, a safety track zone is provided. The safety track zone starts at sector address 30000h and covers 32 blocks up to sector address 301FFh. The security track zone prevents others, data from being destroyed due to an error such as tracking output caused when recording a test signal in a subsequent disk test area. No data is recorded in the sectors in this area. The disk test zone is provided on the following 64 blocks covering sector addresses from 30200h to 305FFh to test the disc quality and other characteristics by the manufacturer. A control test zone is provided on the following 112 blocks covering sector addresses from 30600h to 300FFh for tests such as-adjusting the power of a laser in a controller device. Another zone of safety tracks is provided over the next 32 blocks covering sector addresses from 30000h to 30EFFh to perform functions similar to those of the previous safety track zone. A disk ID zone is provided over the next eight blocks covering the sector addresses from 30F00h to 30F7Fh to record copying management information.

DMA zones are provided over the following eight blocks covering sector addresses from 30F80h to 30FFFh for disk defect handling. The data area starts from the next address 31000h. The data area is divided into 24 zones from zone 0 to zone 23_ as described above. Each zone consists of 1888 tracks with an exception that zone 0 includes only 1647 tracks because the part covering 256 blocks (4096 sectors) from the head belongs to the initial area as described above. Each zone is shown as an example in figure 1. About 95% of the blocks in each zone are used as data blocks to record user data.The logical address of each sector included in the data blocks represents an address obtained by adding the logical address to the physical address of the header sector in the data area (address 31000h in this example) For the head and end of each zone in the data area, 48 to 80 sectors are assigned (which correspond to two) or more clues from each zone) as intermediate buffer sectors, such buffering sectors are provided because in each region of header region areas it sometimes fails to be - continuous with the preceding sector and therefore no data is recorded in the buffer sectors. Most of the remaining 5% of the blocks in each zone serve as spare sectors, which replace sectors in the data blocks when the latter become defective, to be used as sectors for data recording. The physical address of the sector to be used for data recording changes by the previous replacement. However, the logical address (data ID number) of the user data does not change as described above. Therefore, a table is prepared and recorded that associates the physical address of the sector with the logical address in the DMA zones. The final area follows zone 23, starts from sector direction 16B480h and expands to the outermost circumference of the disk. Practically the same areas as those in the part of the rewritable area are located in the initial area are assigned to the output area. The DMA zones are provided- first at the head of the final area for the handling of disk defect as described above. Thus, the four DMA zones, the DMA 1 &2 zones on the internal side and the DMA 3 &4 areas on the external side, have the data area between them. A disk ID zone is provided over the next eight blocks covering addresses of sector from 16B500h to 16B57Fh to record copying management information. A safety track zone is provided over the next 32 blocks covering sector addresses from 16B580h to 16B77Fh. No data is recorded in this area. A controller device test zone is provided on the following 112 blocks covering the sector addresses from 16B780h to 16BE7Fh for tests such as adjustment of a laser power in a controller device. A disk test zone is provided - over the following 112 blocks covering sector addresses - from 16BE80h to 16C57Fh for disk quality testing and other features by the disk manufacturer. Another zone is provided - of security tracks during 3343 blocks that cover sector directions from 16C580h to _17966Fh. No data is recorded in this area. - Thus, as seen from the schematic dietribution of the areas of the optical disk according to the present invention, the rewritable area starts at a radius of 24.00 mm from the disk as in the case of the read-only DVD area. The header sector in the rewritable area is the same as the address as the header sector address in the read-only DVD data area.

The addresses of the sectors in the control data area are the same as the addresses of the operators in the control data area of the read-only DVD. With this arrangement, it is possible for a controller device compatible with these two types of disks to always look for the same sector addresses to reproduce the control data signals from the sectors of the same addresses. Therefore, such a controller device compatible with the two different types of disks can follow the same procedure to activate these two types of disks. As a result, effective control of the controlling device is achieved. A schematic distribution of the rewritable area according to the present invention will be described. The logical address of each sector included in the data blocks of the data area is the same as the address of each sector in the data area of the read-only DVD. While the address of the header sector in the data area of the read-only DVD is 30000h, the physical address of the header sector in the data area of the rewritable area is 31000h. J - In this example, the logical address of the header sector is set to 30000h so that it is the same as the logical address of the header sector of the read-only DVD. The direction The logic of each sector in the subsequent blocks of data is obtained by adding the logical address to JThe logical address of the sector of the heading (30000h in this example). With this address setting, the logical addresses of the sectors in the data blocks overlap the addresses of the sectors in the part of the rewritable area located in the initial area. This problem can be solved by adding to the data ID number the type of area to which the sector belongs, so that this sector in the initial area or in the data area can be estimated. Thus, in the previous example, the logical addresses of the sectors in the data blocks in the data area are the same as the addresses of the sectors in the data area of the read-only DVD. With this arrangement, it is possible for a controller device compatible with these two types of disks to always look for the same sector addresses during the reproduction of user data. Therefore, such a device-controller compatible with the two different types of disks can follow the same procedure for the activation of these disks. As a result, effective control of this controlling device is achieved.

In the previous examples, the format shown in Figure 7 was used as the format for the read-only area and the format shown in Figure 9 was used as the sector format for the rewritable area. of sector are not restricted to these, but the sector format for the "130 mm rewritable optical disk" described above can also be used. Thus, in accordance with the present invention, the optical disc includes the read-only area where a plurality of read-only tracks are formed and the re-writable area where a plurality of read-only tracks form. Each of the plurality of read-only tracks is divided into a plurality of first sectors. A signal is pre-recorded in at least one of the plurality of first sectors under a predetermined reproduction format. Each of the plurality of rewritable tracks is divided into a plurality of second sectors. A signal is recordable in at least one of the plurality of second sectors under a predetermined recording format. The read-only area is located on the inside of the optical disk, while the rewritable area is located on the outside of the optical disk.

Therefore, the control data signal is recorded in the read-only area where a region for recording header information is not provided. This means that the control data signal is recorded under the sector format for the first sectors in the read-only area that is smaller in redundancy than the sector format for the second sectors in the rewritable area. This improves the efficiency of the rewritable optical disk recording region. Also, in accordance with the present invention, the optical disk is compatible with the read-only optical disk and includes the read-only area where a plurality of read-only tracks are formed and the rewritable area where a blank is formed. plurality of rewritable tracks. Each of the plurality of read-only tracks is divided into a plurality of first sectors. A signal is pre-recorded in at least one of the plurality of first sectors under a predetermined reproduction format. Each of the plurality of rewritable tracks is divided into a plurality of second sectors. A signal is recordable in at least one of the plurality of second sectors under a predetermined recording format that includes the predetermined reproduction format. The read-only area is located on the inner part of the optical disk while rewritable area is located on the external part of the optical disc. Therefore, the control data signal is recorded in the read-only area located on the inside of the optical disk, as in the case of the read-only optical disk, under the same sector format as that used for the disk read-only optical. As a result, a controller device which is compatible with both the rewritable optical disk and the read-only optical disk can reproduce data from any optical disk mounted on the controller device, the rewritable optical disk or the read-only optical disk, under the same sector format. The controller device can also detect the control signals recorded on both types of optical discs and activate these optical discs in an easy way. This eliminates the need to provide a special region such as the PEP region described above.

Claims (14)

REINVINDICATIONS

1. - An optical disc comprising a read-only area in which a plurality of read-only tracks are formed and a rewritable area in which a plurality of rewritable tracks are formed, characterized in that each of the plurality of read-only tracks they are divided into a plurality of first sectors, a signal is pre-recorded in at least one of the plurality of first sectors under a predetermined reproduction format, each of the plurality of rewritable tracks is divided into a plurality of second sectors, a signal it is writable in at least one of the plurality of second sectors under a predetermined recording format that includes the predetermined reproduction format, and the read-only area is located in an internal part of the optical disk while the rewritable area is located in an external part of the optical disc.

2. An optical disk according to claim 1, further characterized in that the plurality of first sectors is aligned in a radial direction of the optical disk.

3. - An optical disk according to claim 1, further characterized in that a hole array is formed in the reading-only area, spiral or concentric grooves are formed in the rewritable area, and the depth of the hole arrangement is practically the same. same as the depth of the furrows.

4. An optical disk in accordance with claim 1, further characterized in that a reference signal is pre-recorded for reproduction adjustment in the first sectors of the number equal to a multiple of the number of first sectors included in a -block of error correction, and the first sectors where the reference signal is pre-recorded are located within a cycle of the read-only track.

5. An optical disk according to claim 1, further characterized in that the rewritable area includes a data area where user data is recorded, the data area includes an initial area that has a zone to test the recording and an area end that has an area to test the recording, and the initial area is located on an internal side of the data area and the final area is located on an external side of the data area.

6. An optical disk comprising a read-only area in which a plurality of tracks are formed. read only and a rewritable area in which a plurality of rewritable tracks are formed, characterized in that each of the plurality of read-only track is divided into a plurality of first sectors, a signal is pre-recorded in at least one of the plurality of first sectors under a predetermined reproduction format, each of the plurality of re-writable tracks is divided into a plurality of second sectors, a signal being recordable in at least one of the plurality of second sectors under a predetermined recording format including the default reproduction format, the read-only area is located on an internal part of the optical disc, while the rewritable area is located on an external part of the optical disc, and a connection zone is provided between the read-only area and the rewritable area, nor the signal under the default playback format, nor the signal under the recording format default are recorded in the connection area.

7. An optical disk according to claim 6, further characterized in that the width of the connection area in the radial direction is set smaller than an amount of eccentricity of the optical disc.

8. - An optical disk according to claim 6, further characterized in that an address increased in one direction from a direction of a last sector in the read-only area is used as an address of a header sector in the rewritable area.

9. An optical disk compatible with a read-only optical disk that includes a read-only area that has a plurality of read-only tracks, each of the plurality of reading tracks is divided into a plurality of first sectors, signals are pre-recorded in at least one of the plurality of first sectors under a predetermined reproduction format, the optical disk comprises a read-only area _in which a plurality of read-only track is formed and a rewritable area in which rewritable tracks are formed, characterized in that each of the plurality of read-only tracks is divided a plurality of first sectors, a signal is pre-recorded in at least one of the plurality of first ectors under - a predetermined reproduction format, each of the rewritable track plurality a plurality of second sectors is divided, a signal is recordable in at least one of the plurality of second sectors under a predetermined recording format that includes the predetermined playback format, and the solo area The reading is located on an internal part of the optical disc, while the rewritable area is located on an external part of the optical disc.

10. An optical disk according to claim 9, further characterized in that an address of an emitter for recording a control data signal is the same as a direction of a sector for recording a control data signal of the optical disk of read only.

11. An optical disk according to claim 9, further characterized in that an address of a header sector in the rewritable area is the same as an address of a header sector-in a data area of the read-only optical disk .

12. An optical disk according to claim 9, further characterized in that a radial position of a header sector in the rewritable area is the same as a radial position of a header sector in the data area of the optical disk of only reading.

13. - An optical disk according to claim 9, further characterized in that a logical address of a sector in a data area of the rewritable area is obtained by adding a logical address to a physical address to a header sector in the data area.

14. An optical disk according to claim 9, further characterized in that a logical address of a header sector in a data area of the rewritable area is the same as an address of a header sector in a data area of the disk read-only optical. In a read-only area, each track is divided into sector regions that have the same capacity. An error correction code is added to a first data signal to constitute a second data signal, which is recorded in each sector region by the formation of a hole array. In a rewritable area, user data to be recorded are matched to the first data, to which the same error correction code is added as in the read-only area, to constitute the second data signal as in the area read only A data signal is added to the resulting signal to make the signal rewritable, to constitute a third data signal. A header region representing the sector address information is added to the region to record the third data signal, to form a rewritable format. The optical disk is divided into two areas in the radial direction; the rewritable area on the outer circumference side and the read only area on the inner circumference side. A control data signal is recorded in the read-only area.