JP2004227689A - Information reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correctly reproduce the information of an information recording medium with information recorded by a multisession recording method. <P>SOLUTION: A CPU controller 10 reproduces a lead-in area of a first session of an optical disk 13 to obtain the first address and the last address, reproduces introduction areas of the successive sessions to obtain the first address and the last address at the time of checking whether the successive sessions exist, in addition, sequentially reproduces the whole sessions until confirming that no successive recording section exists, and finally acquires recorded capacity and the first and last addresses of the final session by obtaining the final address of the last recorded session to store the recorded capacity and the first and last addresses in a nonvolatile memory 9, sending a reply to a host computer 12 through an external interface 11. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to information on optical disks such as a CD-ROM disk, a CD-R disk, a CD-RW disk, a DVD-ROM disk, a DVD-R disk, a DVD-RW disk, a DVD-RAM disk, a DVD + RW disk, and a DVD + R disk. Optical disc drive such as CD-ROM drive, CD-R drive, CD-RW drive, DVD-ROM drive, DVD-R drive, DVD-RW drive, DVD-RAM drive, DVD + RW drive, DVD + R drive, MO, MD for reproducing. Magneto-optical disk drives such as MO drives and MD drives for reproducing information on magneto-optical disks such as HDDs, and hard disk drives for reproducing information on magnetic disks such as hard disks (HD) and flexible disks (FD). Information reproduction for reproducing information on an information recording medium used in a computer system such as a magnetic disk drive such as a disk drive and a memory card drive for reproducing information such as a memory card such as a nonvolatile RAM and a flash ROM (Flash ROM). Equipment related.
[0002]
[Prior art]
For example, in a CD-R disc and a CD-RW disc (hereinafter collectively referred to as a “CD-R / RW disc”) as information recording media, one recording block or a plurality of recording blocks are included in a recording section (Session). Recording block groups exist. The recording block is called a track.
As is well known, information of each track (referred to as “track (Track) information”) is present in the entire CD-R / RW disc (regardless of the number of sessions) and collectively manages track information (Track). It is recorded in an information management area (referred to as “PMA”) or a recording section management area (“lead-in area” (TOC)).
This CD-R / RW disc also employs the multi-session recording method, and the CD-R / RW drive device can record information in each recording section (Session).
[0003]
A CD-R / RW disc on which information is recorded by the multi-session recording method (referred to as a “multi-session disc”) has a lead-in area for the number of sessions. By transferring the TOC data recorded in the area to the host computer, an application program or an operating system (OS) running on the host computer can obtain the disc information of the CD-R / RW disc.
As a standard for reproducing a CD-R / RW disc, there is a multi-read (Multi Read) standard. Most CD-ROM drive devices on the market conform to the multi-read standard, and a multi-session disc is used. , And reproduction of user data recorded on a CD-R / RW disc.
[0004]
The disc information can be correctly returned to the host computer from the CD-ROM drive or the CD-R / RW drive, so that the host computer can correctly recognize the file format. In other words, a part of the management area that manages the information of the file format such as the UDF format is near the final recording address, and the multi-read standard CD-R / RW drive device sends the host computer the correct disc information on the recording unit. Can be returned, so that the file format can be correctly recognized. Therefore, according to the multi-read standard CD-ROM drive or CD-R / RW drive, directories and files can be correctly reproduced.
In a conventional multi-read CD-ROM drive device or CD-R / RW drive device, discrimination between an unrecorded portion and a previously recorded location is determined by relying on reflected light from a disc (for example, see Patent Reference 1).
[0005]
[Patent Document 1]
JP-A-5-314486
[0006]
[Problems to be solved by the invention]
Incidentally, for example, a DVD + R disc is a disc that is compatible with existing DVD-ROM drives. This DVD + R disc is a write-once (Write Once) disc whose physical performance such as the reflectance of the disc is almost the same as that of a stamped DVD-ROM disc, and in which information can be written only once and cannot be overwritten.
A DVD + R drive capable of recording information on such a DVD + R disc employs a multi-session recording method by utilizing a feature that information can be written only once.
[0007]
The multi-session recording method is a method of recording information in a predetermined recording section (referred to as "session") in which information can be dividedly written on an optical disc several times, and the recording is performed every time a DVD + R disc is additionally recorded. This is a write-once method in which the sections are increased to a plurality of addresses in ascending order from the youngest address.
The DVD + R disc also has a recording block group including one recording block or a plurality of recording blocks in a session. This recording block is called a fragment, and in a CD, it corresponds to a track.
The size (Size) of the capacity of this fragment is a multiple of 16 sectors. 16 sectors are the minimum unit of recording and reproduction of a DVD disc, and are called ECC blocks (ECC Blocks). That is, there are 16 sectors per ECC block.
[0008]
Unlike the CD-R / RW disc, the fragment information (referred to as “fragment information”) does not include an area in which fragment information of the entire disc can be collectively managed.
In order for a drive device for reproducing a DVD + R disc to obtain fragment information existing in each session, a control data zone (Control Data Zone) in a lead-in area (Lead-In) at the beginning of the session (first session) is required. ), And a session disc control block (Session Disc Control Block: SDCB) in an intro area of the second and subsequent sessions in the physical format information area (SDCB).
[0009]
Also, a disc ID, which is disc identification information uniquely assigned to each DVD + R disc, is in the lead-in area.
In the multi-session format of the DVD + R disc, the host computer issues a playback command to the drive device for a closure (closure) area at the end of each session or an intro area at the beginning of the second and subsequent sessions. It is possible to obtain information recorded in that area by sending the information. This is because the sector format type of the closure area and the intro area is a data area (Data Area).
[0010]
However, in the conventional information reproduction of a DVD-ROM drive or the like for reproducing information of a multi-session disk such as a DVD + R disk, there is no multi-read standard referred to as a CD, and there are cases where an unrecorded portion is interposed. There is a problem in that it is impossible to obtain information in the intro area and disk information of the multi-session disk, and it is impossible to obtain correct disk information from the multi-session disk and transfer it to the host computer.
[0011]
Since only one session exists on the stamp disk, there is only one lead-in area.
For example, the DVD-ROM drive can reproduce the physical format information area in the control data zone of the lead-in area, and obtain the final address of the data area of the disc from the data zone allocation field (Data Zone Allocation Field).
[0012]
The DVD + R disc also has a physical format information area at the same position as described above. However, in a multi-session disc, the last address recorded in this data zone allocation field is not the last address of the recording unit, but The maximum writable address is recorded.
That is, even for a multi-session disc in which an unrecorded portion exists in the outer peripheral direction, the last address of the unrecorded portion is recorded, and the DVD-ROM drive erroneously acquires the recording capacity. In addition, since there is no reproduction signal in the unrecorded portion, there is a problem that the seek operation of the drive device becomes impossible.
[0013]
Further, the OS and application programs running on the host computer also misplace the management area for managing information of a file format such as the UDF format recorded on the disk, and file and directory information recorded on the disk. Trouble that cannot be obtained.
For example, in the case of the UDF format, the file management information is recorded at the position N-256 of the session start address + 256 and the final address N of the recording unit recording unit. Most likely. As described above, if the host computer does not know the correct recording capacity and the start address of each session, there is also a problem that files and directories cannot be reproduced on a DVD + R disc.
[0014]
The present invention has been made to solve the above-described problem, and has as its object to correctly reproduce information on an information recording medium on which information is recorded by a multi-session recording method.
[0015]
[Means for Solving the Problems]
The present invention provides the following (1) to (4) information reproducing apparatus to achieve the above object.
(1) When information is recorded from an information recording medium recorded in a recording section unit composed of one recording block or a recording block group composed of a plurality of recording blocks and having one or more recording sections, Means for reproducing the information of the recording section management section recorded at the beginning of the recording section of the information recording medium to obtain a start address and an end address of the recording section; and a recording section subsequent to the recording section reproduced by the means. Means for confirming whether or not exists, and when it is confirmed that a subsequent recording section exists, by reproducing the information of the recording section management section recorded at the head of the subsequent recording section, Means for obtaining a start address and an end address of the recording section, and recording on the information recording medium until it is confirmed that the following recording section does not exist. The recording section managers of all the recording sections recorded are reproduced in order, and the last address of the recording section recorded last is obtained, so that the recorded capacity for the information recording medium and the start address and end address of the last recording section are obtained. An information reproducing apparatus provided with a means for acquiring the information.
[0016]
(2) In the information reproducing apparatus of (1), the means for confirming whether or not there is a recording section subsequent to the reproduced recording section includes an address obtained by adding a predetermined value to the last address of the immediately preceding recording section. An information reproducing apparatus which is means for reproducing and confirming that a subsequent recording section exists when a reproduction error does not occur, and confirming that a subsequent recording section does not exist when a reproduction error occurs.
[0017]
(3) In the information reproducing apparatus of (1), means for storing the start address and the end address of the recording section in association with the identification information of the information recording medium, and when the information recording medium is inserted, An information reproducing device provided with means for detecting identification information of the information recording medium and acquiring, from the stored identification information, a start address and an end address of a last recording section corresponding to the identification information corresponding to the detected identification information; apparatus.
(4) In the information reproducing apparatus of (1), means for storing a start address and an end address of the recording section in association with a disc ID of the information recording medium, and when the information recording medium is inserted, An information reproducing apparatus provided with means for detecting a disk ID of the information recording medium and acquiring, from the stored disk ID, a start address and an end address of a last recording section corresponding to the disk ID corresponding to the detected disk ID; apparatus.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of an optical disk recording / reproducing apparatus according to an embodiment of the present invention.
This optical disk recording / reproducing device is a DVD + R drive device for reproducing information (data) on an optical disk such as a DVD + R disk and recording data on the optical disk, and corresponds to an information reproducing device for reproducing information on an information recording medium.
This optical disk recording / reproducing apparatus is connected to a host computer 12 which receives a data recording / reproducing command, and records and reproduces information (data) on / from an optical disc 13 such as a DVD + R disc as an information recording medium based on the command. Do. The motor (spindle motor) 1 rotates the optical disc 13 when mounting the optical disc 13 and recording and reproducing data.
[0019]
The optical pickup 2 can perform a minute operation, and irradiates the optical disc 13 with light L generated by a light source such as a laser to read data recorded on a recording surface and record data.
The coarse motor 3 is a motor that moves the optical pickup 2 in the radial direction of the optical disc 13.
The rotation control system unit 4 controls the rotation of the motor 1.
The coarse movement motor control system unit 5 controls the rotation of the coarse movement motor 3.
The optical pickup control system 6 controls the light emission of the optical pickup 2 and the like.
The signal processing system unit 7 processes signals from the optical pickup 2 and transmits and receives data for recording data on the optical disk 13 and data reproduced from the optical disk 13.
[0020]
The buffer memory 8 is an area for temporarily storing data reproduced from the optical disc 13 and data to be recorded on the optical disc 13.
The non-volatile memory 9 is an area for retaining various settings even when the power is turned off, in which a control program of the CPU / controller 10 and data to be stored for a long time are stored in advance. The information such as the head address, the last address, and the recorded capacity of each recording section on the optical disk 13 is stored and secured in association with the disk ID (corresponding to identification information (medium identification information)) or volume name of the disk 13.
The CPU / controller 10 is realized by a microcomputer and controls the entire optical disk recording / reproducing apparatus, and also performs various functions according to the present invention. The controller includes a small amount of memory such as a register, and performs data input / output control of the buffer memory 8 and signal processing.
[0021]
The optical disk recording / reproducing apparatus stores data read from the optical disk 13 in a buffer memory 8, and transfers the data in the buffer memory 8 to a host computer via an external interface 11 under the control of a controller of a CPU / controller 10.
The host computer 12 is a device such as a personal computer that communicates via the external interface 11 of the optical disk recording / reproducing device. The communication issues a command to the optical disk recording / reproducing device, and the optical disk recording / reproducing device responds to the command of the command. Do it by doing. Through the command, it is possible to change the reproduction mode or to give an instruction as to where and how much the reproduction is actually to be performed.
[0022]
That is, information recorded in the non-volatile memory 9 in the computer in a recording section unit composed of one recording block or a recording block group composed of a plurality of recording blocks, and one or more recording sections exist. When acquiring information from the recording medium, the procedure of reproducing the information of the recording section management section recorded at the head of the recording section of the information recording medium and obtaining the top address and the last address of the recording section, A procedure for confirming whether or not a recording section following the reproduced recording section exists, and a record recorded at the head of the subsequent recording section when the procedure confirms that a subsequent recording section exists. A procedure for reproducing the information of the section management unit to obtain the start address and the last address of the recording section, and that there is no subsequent recording section by the above procedure. Until it is confirmed, the recording section management sections of all the recording sections recorded on the information recording medium are sequentially reproduced, and the final address of the recording section recorded last is obtained by recording on the information recording medium. A program for executing a procedure for obtaining the start address and the end address of the used capacity and the last recording section is stored.
[0023]
Further, the procedure for checking whether or not there is a recording section following the reproduced recording section is performed by reproducing an address obtained by adding a predetermined value to the last address of the immediately preceding recording section, and when no reproduction error occurs. A procedure may be adopted in which it is confirmed that a subsequent recording section exists, and when a reproduction error occurs, it is confirmed that there is no subsequent recording section.
[0024]
Further, a procedure for storing the start address and the end address of the recording section in association with the identification information of the information recording medium, and when the information recording medium is inserted, detecting the identification information of the information recording medium, A program for executing a procedure for obtaining the start address and end address of the last recording section corresponding to the identification information corresponding to the detected identification information from the stored identification information may be added.
Alternatively, a procedure for storing the start address and the end address of the recording section in association with the disc ID (or volume name) of the information recording medium, and, when the information recording medium is inserted, the disc of the information recording medium. ID (or volume name) is detected, and from the stored disk ID (or volume name), the final recording section corresponding to the disk ID (or volume name) corresponding to the detected disk ID (or volume name) is detected. A program for executing the procedure for acquiring the start address and the end address may be added.
[0025]
When the CPU / controller 10 executes the above-described program, recording is performed in a recording section unit composed of one recording block or a recording block group including a plurality of recording blocks, and one or more recording sections are recorded. When acquiring information from an existing information recording medium, means for reproducing the information of the recording section management unit recorded at the head of the recording section of the information recording medium, and obtaining a start address and an end address of the recording section, Means for confirming whether or not there is a recording section subsequent to the recording section reproduced by the means, and recording at the head of the subsequent recording section when the means for confirming the existence of the subsequent recording section Means for reproducing the recorded information of the recording section management unit to obtain a start address and an end address of the recording section; Until it is confirmed that the recording section does not exist, the recording section management sections of all the recording sections recorded on the information recording medium are sequentially reproduced, and the last address of the recording section recorded last is obtained. It functions as a means for acquiring the recorded capacity for the information recording medium and the start address and end address of the last recording section.
[0026]
As means for checking whether or not there is a recording section following the reproduced recording section, an address obtained by adding a predetermined value to the last address of the immediately preceding recording section is reproduced. It also functions as means for confirming that a subsequent recording section exists, and for confirming that there is no subsequent recording section in the case of a reproduction error.
[0027]
Further, the non-volatile memory 9 and the CPU / controller 10 function as a means for storing the start address and the end address of the recording section in association with the identification information of the information recording medium. When the information recording medium is inserted, the identification information of the information recording medium is detected, and the head address of the last recording section corresponding to the identification information corresponding to the detected identification information is detected from the stored identification information. Acts as a means for obtaining an end address.
[0028]
Alternatively, the non-volatile memory 9 and the CPU / controller 10 function as means for storing the head address and the end address of the recording section in association with the volume name of the information recording medium, and the CPU / controller 10 When the information recording medium is inserted, the volume name of the information recording medium is detected, and the head address of the last recording section corresponding to the volume name corresponding to the detected volume name is detected from the stored volume name. Acts as a means for obtaining an end address.
[0029]
Hereinafter, the operation according to the present invention in the case where the optical disk 13 in the optical disk recording and reproducing apparatus reproduces a DVD + R disk on which data is recorded by the multi-session recording method will be described.
As described above, a DVD + R disc on which data is recorded by the multi-session recording method has one recording block (referred to as “fragment”) or one recording section (“session”) composed of a plurality of recording blocks. (Hereinafter referred to as “Session”) or an optical disc on which data is recorded in a plurality of recording sections, and sessions (second session to Nth session: N is a positive integer) subsequent to the first session (first session). ) Has an area called an intro (Intro) area similar to the lead-in (Lead-in) area in the first session. In the intro area, the head address (start address) and the last address (start address) of the session are provided. End address) is recorded.
[0030]
An intro area is provided before the data area in the second to Nth sessions, and a fixed-length area called a closure area is provided behind the data area (the intro area includes 1024 sectors, and the closure area includes 1024 sectors). Become). In addition, a start address and an end address of the first session are recorded in the above-mentioned physical information block (Physical Information Block) as information unique to the DVD + R disc. For example, the start address of the data part of the second session is a location obtained by adding a total of 2048 Kbytes (KB: 1000 sectors) of the closure area and the intro area to the end address of the data part of the first session.
[0031]
Also, the session control data (Session Control Data: SCD) recorded in the intro area is located at the offset (Offset: 320 sectors) of the intro area. The session information can be obtained by reproducing the SCD. Therefore, in this optical disk recording / reproducing apparatus, it is possible to reach the final session by sequentially tracing the SCD from the inner circumference of the DVD + R disk.
[0032]
Also, when the number of sessions increases, the above method frequently requires access to the SCD every time a DVD + R disc is set, and it takes a considerable amount of time to reach the final session. This takes a considerable amount of time from when the user inserts the DVD + R disc to when the disc is actually available, greatly reducing the usability. Therefore, for a DVD + R disc that has been reproduced once, the start address and the end address of the last session are stored, so that the next access can be started quickly. Since this optical disk recording / reproducing apparatus includes the nonvolatile memory 9, this operation can be performed by using the nonvolatile memory 9.
[0033]
In addition, when additional recording is performed on a DVD + R disc, in a file format compatible with ISO9660, the file and directory information of the previous session are all recorded at the head of the data area of the new session. The OS and the application program can obtain the latest information of the files and directories existing on the DVD + R disc by obtaining the start address of the last session. In other words, since almost the same means as in the multi-session of the CD can be used, changes in the OS and application programs of the optical disk recording / reproducing apparatus can be reduced.
[0034]
FIG. 2 is a diagram simply showing a multi-session format of a DVD + R disc on which data is recorded by the multi-session recording method.
The DVD + R disk has tracks in a spiral form from the inner periphery like many other disk-shaped media, and addresses are one-dimensionally allocated. Here, the format of a DVD + R disc in which data is recorded one session at a time in three times is shown. In the multi-session recording method, the first recording unit is a session (corresponding to “recording section”), and the second recording unit is a fragment.
That is, as shown in (a) of the figure, there are three first sessions (S1) 20, second sessions (S2) 20, and third sessions (S3) 20 in order from the left side in the figure.
[0035]
The first session (S1) 20 includes a lead-in (Lead-in) area 21 at the head, a first fragment (F1) and a second fragment (F2), as shown in FIGS. ) Are recorded, and a closure area 23 is recorded.
The second session (S2) 20 includes an intro area 24 corresponding to the lead-in area of the first session, and three fragments, a third fragment (F3) 22, a fourth fragment (F4) 22, and a fifth fragment (F5) 22. A fragment (Fragment) and a closure area 23 are recorded.
The last third session (S3) 20 shows the state when the sixth fragment (F6) 22, which is one fragment (Fragment), is recorded in the example shown in FIG. Indicates the state of the session.
The lead-in area 21 and the intro area 24 correspond to a recording section management unit.
[0036]
In addition, the example shown in FIG. 3C shows a state in which a disc created once is additionally written twice from the disc, and is taken out with a lead-out (Lead-Out) area. The last third session (S3) 20 includes an intro area 24, a sixth fragment (F6) 22, and a read-out (Lead-out) signifying that the recording of the medium has been completed because no more recording is performed at the end. An area 25 is recorded.
The host computer 12 sends a reproduction command to the optical disk recording / reproducing apparatus to obtain information recorded in the closure area at the end of each session or the intro area at the beginning of the sessions after the second session. It is possible. This is because the sector format type of the closure area and the intro area is a data area (Data Area).
[0037]
Next, the processing according to claims 1 and 2 of the present invention in the optical disk recording / reproducing apparatus will be described.
FIG. 3 is a flowchart showing a process according to claims 1 and 2 of the present invention in the optical disc recording / reproducing apparatus shown in FIG.
In this process, when no device is operating, the CPU / controller 10 is in a state of waiting for a command in a command waiting loop process of step (indicated by “S” in the figure) 1 and is executed by the host computer. When the command is received, first, in step 2, it is determined whether or not a multi-session format DVD + R disc is actually inserted, and it is determined whether or not the DVD + R disc is not inserted. If it is determined that this is the case, the process proceeds to step 11, where error processing is performed, and this processing is immediately terminated.
[0038]
On the other hand, if it is determined in step 2 that a DVD + R disc is inserted and it is determined that a DVD + R disc is present, the flow advances to step 3 to read the physical information block in the lead-in area of the first session (First Session) and read the physical information block. The start address (start address) and end address (end address) of the first session are obtained from the information block and stored in the non-volatile memory, the buffer memory or the memory of the controller. The address of the next session that is assumed to exist at the time of the assumption is set to the end address of the first session by a predetermined value X (in the case of a DVD + R disc: X = 1000 + 320 sectors, the closure area, the buffer zone (Bu) FFZ), an ID zone (ID Zone)) is added, and a read operation is performed for the vicinity of the address, that is, the address where the next session will be present.
[0039]
In step 5, it is determined whether or not a read error (read error) has occurred. If it is determined that a read error has occurred, it is determined that the DVD + R disc has only the first session. In step 8, the current session (starting in step 3) is determined. The first session in which the address and the end address have been obtained is determined as the final session, the recorded capacity of the session and the number of sessions are determined and stored in the non-volatile memory, the buffer memory, or the memory of the controller. The session information such as the start address, end address, recorded capacity, and the number of sessions is returned to the host computer, and this process is ended in step 10 to shift to a command waiting loop process.
[0040]
If it is determined in step 5 that a read error does not occur, the address of the second session can be read, so the flow advances to step 6 to start the current session (second session) from the SCB included in the intro area of the second session. The address and the end address are obtained and stored in the non-volatile memory, the buffer memory or the memory of the controller, and the address of the next session that will exist when the third session is assumed to exist from the end address in step 7 is obtained. A predetermined value X is added to the end address of the two sessions, and a read operation is performed for the vicinity of the address, that is, an address where the next session will exist, and the process returns to step 5 to determine whether a read error has occurred. Judge.
[0041]
If it is determined in step 5 that a read error has occurred, it is determined that the DVD + R disc has only the second session. In step 8, the current session (the second session in which the start address and end address are obtained in step 7) is replaced with the final session. Is determined, and the recorded capacity and the number of sessions of the session are determined and stored in the non-volatile memory, the buffer memory or the memory of the controller. In step 9, the start address and end address of the session, the recorded capacity, the number of sessions, etc. Is returned to the host computer, and the process is terminated in step 10 to shift to a command waiting loop process.
[0042]
On the other hand, if it is determined in step 5 that a read error does not occur, the address of the third session has been read, so the flow advances to step 6 to start the current session (second session) from the SCB included in the intro area of the third session. An address and an end address are obtained and stored in a nonvolatile memory, a buffer memory, or a memory of a controller.
In this way, the processes of steps 5 to 7 are repeated to reproduce each session of the DVD + R disc in ascending order from the beginning. If it is determined in step 5 that a read error has occurred, the current session is determined as the last session in step 8 and the session is determined. The recorded capacity and the number of sessions are determined and stored in a non-volatile memory, a buffer memory or a memory of the controller. In step 9, session information such as the start address and end address of the session, the recorded capacity, and the number of sessions are stored in the host computer. The process is terminated in step 10 and the process proceeds to a command waiting loop process.
[0043]
In this manner, an optical disk recording / reproducing apparatus compatible with a DVD + R multi-session disk can be made without changing the optical disk reproducing apparatus such as a conventional optical disk recording / reproducing apparatus so much. Further, even a device for reproducing an optical disk already operating in the market can reproduce a DVD + R disk of a multi-session disk only by changing the control program. Further, if the control program is stored in the nonvolatile memory as described above, it is easy to upgrade the version. Therefore, low cost and an effect of not wasting the apparatus can be expected.
In addition, by using a read error for the final session determination of a DVD + R multi-session disc, the determination can be made simply without providing any additional device, and there is an effect that the determination can be made quickly at low cost.
[0044]
Next, the processing of the optical disk recording / reproducing apparatus according to claims 1, 2 and 3 of the present invention will be described.
This process is a control procedure using the disc ID of the DVD + R disc, and is obtained by adding a procedure for speeding up the final session determination by the disc ID to the above-described process.
FIG. 4 is a flow chart showing the processing according to claims 1, 2 and 3 of the present invention in the optical disk recording / reproducing apparatus shown in FIG.
This processing is a state in which the CPU / controller 10 is in a state of waiting for a command in a command waiting loop process of a step (indicated by “S” in the figure) 21 when no device is operating, When the command is received, first, in step 22, it is determined whether or not a multi-session format DVD + R disc is actually inserted, and it is determined whether or not the DVD + R disc is not inserted. If it is determined that this is the case, the routine proceeds to step 34, where error processing is performed, and this processing is immediately terminated.
[0045]
On the other hand, if it is confirmed in step 22 that a DVD + R disc is inserted and it is determined that a DVD + R disc is present, the process proceeds to step 23, where the disc ID of the DVD + R disc is checked to determine whether or not the disc ID can be confirmed. The disc ID is in the lead-in area of the first session.
If it is determined in step 23 that the disc ID has been confirmed, the process proceeds to step 24 to search from the nonvolatile memory in the optical disc recording / reproducing apparatus whether the start address and end address of the last session corresponding to the disc ID are stored, and Is found, the address is read out, and it is determined in step 25 whether or not a read error has occurred. If a read error has occurred, it is determined that the disc is a new DVD + R disc that has not yet stored disc information, and the process proceeds to step 26. If a read error has not occurred, it is determined that the disc is a DVD + R disc in which disc information is already stored, and the process proceeds to step S30.
[0046]
As described above, since a sufficiently long random number is mainly used for the disk ID, there is almost no possibility of duplication. However, since this is not guaranteed, a procedure for actually performing a read operation and confirming it is necessary. It is.
If a read error occurs in step 25, the process proceeds to step 26, where the physical information block in the lead-in area of the first session (First Session) is read, and the start address (start address) and end address of the first session are read from the physical information block. (Final address) is obtained and stored in the non-volatile memory, the buffer memory or the memory of the controller, and the address of the next session that would be present when the second session is assumed to exist from the end address in step 27 is A predetermined value X (in the case of a DVD + R disc: X = 1000 + 320 sectors, a closure area, a buffer zone (Buffer Zone), and an ID zone (ID Zone)) are added to the end address of one session and derived. Against near the address, i.e. the read operation of the address that will next session exists.
[0047]
It is determined in step 28 whether or not a read error (read error) has occurred. If it is determined that a read error has occurred, it is determined that the DVD + R disc has only the first session, and in step 31 the current session (started in step 26). The first session in which the address and the end address are obtained) is determined as the last session, the recorded capacity of the session and the number of sessions are determined, and the disc ID detected from the DVD + R disc is stored in the nonvolatile memory, the buffer memory, or the memory of the controller. Correspondingly, the start address, end address, recorded capacity, and number of sessions of the current session are stored, and in step 32, session information such as the start address, end address, recorded capacity, and number of sessions of the session is returned to the host computer. Then step 3 terminates this process to migrate to the command wait loop processing.
[0048]
If it is determined in step 28 that a read error does not occur, the address of the second session can be read, and the flow advances to step 29 to start the current session (second session) from the SCB included in the intro area of the second session. The address and end address are obtained and stored in correspondence with the disk ID in the non-volatile memory, the buffer memory or the memory of the controller, and it will be present when it is assumed in step 30 that the third session exists from the end address. The address of the next session is derived by adding a predetermined value X to the end address of the second session, and an operation of reading an address near that address, that is, an address where the next session will exist, is performed. It is determined whether a read error has occurred.
[0049]
If it is determined in step 28 that a read error has occurred, it is determined that the relevant DVD + R disc has only the second session, and in step 31 the current session (the second session in which the start address and end address are obtained in step 29) is changed to the final session. And the recorded capacity of the session and the number of sessions are determined and stored in correspondence with the disk ID of the nonvolatile memory, the buffer memory or the memory of the controller. In step 32, the start address and end address of the session are determined. The session information such as the recorded capacity and the number of sessions is returned to the host computer, and the process is terminated in step 33 to shift to a command waiting loop process.
[0050]
On the other hand, if it is determined in step 28 that a read error does not occur, the address of the third session has been read, and the flow advances to step 29 to start the current session (second session) from the SCB included in the intro area of the third session. An address and an end address are obtained and stored in a nonvolatile memory, a buffer memory, or a memory of a controller in correspondence with the disk ID.
In this way, the processes of steps 28 to 30 are repeated to reproduce each session of the DVD + R disc in ascending order from the beginning. If it is determined in step 28 that a read error has occurred, the current session is determined as the last session in step 31 and the session is determined. The recorded capacity and the number of sessions are determined and stored in the nonvolatile memory, the buffer memory or the memory of the controller in correspondence with the disk ID. In step 32, the start address and end address of the session, the recorded capacity, the number of sessions, etc. Is returned to the host computer, and the process is terminated in step 33 to shift to a command waiting loop process.
[0051]
If a read error does not occur in step 25, the end address of the last session is obtained from the disk information corresponding to the corresponding disk ID stored in the memory in step 30, and the next session is determined from the end address. The address of the next session that would exist when it was assumed to be present is derived by adding a predetermined value X to the end address read from the memory, and the address near that address, that is, the address where the next session will exist The operation returns to step 28 to determine whether or not a read error has occurred.
[0052]
If it is determined in step 28 that a read error has occurred, it is determined that the DVD + R disc has only the last session stored in the memory. In step 31, the session is determined as the last session, and the recorded capacity and the number of sessions of the session are determined. And the contents stored in the nonvolatile memory, the buffer memory or the memory of the controller corresponding to the disk ID are maintained, and in step 32, the session start address, the end address, the recorded capacity, the number of sessions, etc. The information is returned to the host computer, and the process is terminated in step 33 to shift to a command waiting loop process.
[0053]
On the other hand, if it is determined in step 28 that a read error does not occur, the address of the next session of the last session stored in the memory can be read, and the flow advances to step 29 to change the current session from the SCB included in the intro area of the next session. The start address and end address of the session are obtained and stored in a nonvolatile memory, a buffer memory, or a memory of the controller in association with the disk ID.
In this way, the processes of steps 28 to 30 are repeated to reproduce each session of the DVD + R disc in ascending order from the beginning. If it is determined in step 28 that a read error has occurred, the current session is determined as the last session in step 31 and the session is determined. The recorded capacity and the number of sessions are determined and stored in the nonvolatile memory, the buffer memory or the memory of the controller in correspondence with the disk ID. In step 32, the start address and end address of the session, the recorded capacity, the number of sessions, etc. Is returned to the host computer, and the process is terminated in step 33 to shift to a command waiting loop process.
With this, even if the same DVD + R disc comes in next time, the latest information is updated, so that the trouble is minimized. By overwriting and updating the same disk ID, the memory usage can be reduced.
[0054]
In this manner, an optical disk recording / reproducing apparatus compatible with a DVD + R multi-session disk can be made without changing the optical disk reproducing apparatus such as a conventional optical disk recording / reproducing apparatus so much. Further, even a device for playing an optical disk already operating in the market can play a DVD + R disk of a multi-session disk only by changing the control program. Further, if the control program is stored in the nonvolatile memory as described above, it is easy to upgrade the version. Therefore, low cost and an effect of not wasting the apparatus can be expected.
[0055]
In order to recognize a multi-session DVD + R disc, the start and end addresses of each session are determined to determine the last session. However, the disc ID of the previously inserted DVD + R disc is stored, and the disc ID is stored. Since disk information is stored in correspondence with the above, at least one session recognition operation is sufficient, so that even if the number of sessions is large, it is not necessary to perform many seek operations, the mounting time is short, and high-speed mounting can be expected. Therefore, there is an effect that the mounting delay can be avoided even a little to make a comfortable use environment.
[0056]
Next, the processing according to claims 1, 2 and 4 of the present invention in the optical disk recording / reproducing apparatus will be described.
This processing is a control procedure using the volume name of the DVD + R disc, and is obtained by adding a procedure for speeding up the final session determination by the volume name to the above-described processing.
FIG. 5 is a flow chart showing the processing according to claims 1, 2 and 4 of the present invention in the optical disk recording / reproducing apparatus shown in FIG.
This processing is a state in which the CPU / controller 10 is in a state of waiting for a command in a command waiting loop process of step (indicated by “S” in the figure) 41 when no device is operating, When the command is received, first, in step 42, it is determined whether or not a DVD + R disc of a multi-session format is actually inserted, and it is determined whether or not the DVD + R disc is not inserted. If it is determined that this is the case, the process proceeds to step 44, where error processing is performed, and this processing is immediately terminated.
[0057]
On the other hand, if it is determined in step 42 that a DVD + R disk is inserted and it is determined that a DVD + R disk is present, the process proceeds to step 43, where the volume name of the DVD + R disk is checked to determine whether or not it has been confirmed. The volume name is in the data area of the first session.
If it is determined in step 43 that the volume name has been confirmed, the process proceeds to step 44 to search from the nonvolatile memory in the optical disk recording / reproducing apparatus whether the start address and the end address of the last session corresponding to the volume name are stored, and Is found, the address is read out, and it is determined in step 45 whether a read error has occurred. If a read error has occurred, it is determined that the disc is a new DVD + R disc that does not yet store disc information, and the flow advances to step 46. If a read error does not occur, it is determined that the disc is a DVD + R disc that already stores disc information, and the process proceeds to step S50.
[0058]
As described above, as with the disk ID, a sufficiently long random number is mainly used for the volume name, so that there is almost no possibility of duplication. However, since this is not guaranteed, a read operation is actually performed. Need a procedure to confirm.
If a read error occurs in step 45, the process proceeds to step 46, where the physical information block in the lead-in area of the first session (First Session) is read, and the start address (start address) and end address of the first session are read from the physical information block. (Final address) is obtained and stored in the non-volatile memory, the buffer memory or the memory of the controller, and the address of the next session that would be present when the second session is assumed to exist from the end address in step 47 is obtained. A predetermined value X (in the case of a DVD + R disc: X = 1000 + 320 sectors, a closure area, a buffer zone (Buffer Zone), and an ID zone (ID Zone)) are added to the end address of one session and derived. Against near the address, i.e. the read operation of the address that will next session exists.
[0059]
In step 48, it is determined whether or not a read error (read error) has occurred. If it is determined that a read error has occurred, it is determined that the DVD + R disc has only the first session, and in step 51, the current session (started in step 46). Address and end address) is determined as the final session, the recorded capacity and the number of sessions of the session are determined, and the volume name detected from the DVD + R disc is stored in the nonvolatile memory, the buffer memory or the memory of the controller. Correspondingly, the start address, end address, recorded capacity, and number of sessions of the current session are stored, and in step 52, session information such as the start address, end address, recorded capacity, and number of sessions of the session is returned to the host computer. Then step 3 terminates this process to migrate to the command wait loop processing.
[0060]
If it is determined in step 48 that a read error does not occur, the address of the second session can be read, and the flow advances to step 49 to start the current session (second session) from the SCB included in the intro area of the second session. The address and end address are obtained and stored in correspondence with the volume name in the non-volatile memory, the buffer memory or the memory of the controller, and it will be present when it is assumed in step 50 that the third session exists from the end address. The address of the next session is derived by adding a predetermined value X to the end address of the second session, and an operation of reading an address near that address, that is, an address where the next session will exist, is performed. It is determined whether a read error has occurred.
[0061]
If it is determined in step 48 that a read error has occurred, it is determined that the DVD + R disc has only the second session. In step 51, the current session (the second session in which the start address and the end address are obtained in step 49) is changed to the final session. And the recorded capacity of the session and the number of sessions are determined and stored in correspondence with the volume name of the nonvolatile memory, the buffer memory, or the memory of the controller. In step 52, the start address and the end address of the session are stored. Session information such as the recorded capacity and the number of sessions is returned to the host computer, and this processing is ended in step 53 and the processing shifts to a command waiting loop processing.
[0062]
On the other hand, if it is determined in step 48 that a read error does not occur, the address of the third session has been read, and the flow advances to step 49 to start the current session (second session) from the SCB included in the intro area of the third session. An address and an end address are obtained and stored in a nonvolatile memory, a buffer memory or a memory of a controller in correspondence with the volume name.
In this way, the processes of steps 48 to 50 are repeated to reproduce each session of the DVD + R disc in ascending order from the beginning. If it is determined in step 48 that a read error has occurred, the current session is determined as the last session in step 51 and the session is determined. The recorded capacity and the number of sessions are determined and stored in the nonvolatile memory, the buffer memory or the memory of the controller in association with the volume name. In step 52, the start address and end address of the session, the recorded capacity, the number of sessions, etc. Is returned to the host computer, and the process is terminated in step 53 to shift to a command waiting loop process.
[0063]
If a read error does not occur in step 45, the end address of the last session is obtained from the disk information corresponding to the relevant volume name stored in the memory in step 50, and the next session is obtained from the end address. The address of the next session that would exist when it was assumed to be present is derived by adding a predetermined value X to the end address read from the memory, and the address near that address, that is, the address where the next session will exist The operation returns to step 48 to determine whether or not a read error has occurred.
[0064]
If it is determined in step 48 that a read error has occurred, it is determined that the relevant DVD + R disc has only the last session stored in the memory. In step 51, the session is determined as the last session, the recorded capacity of the session and the number of sessions. And the contents stored in the nonvolatile memory, the buffer memory, or the memory of the controller corresponding to the above-mentioned volume name are maintained. In step 52, the session address such as the start address and the end address, the recorded capacity, the number of sessions, etc. The information is returned to the host computer, and the process is terminated in step 53 to shift to a command waiting loop process.
[0065]
On the other hand, if it is determined in step 48 that a read error does not occur, the address of the next session of the last session stored in the memory can be read, and the flow advances to step 49 to read the current session from the SCB included in the intro area of the next session. The start address and end address of the session are obtained and stored in a nonvolatile memory, a buffer memory, or a memory of the controller in correspondence with the volume name.
In this way, the processes of steps 48 to 50 are repeated to reproduce each session of the DVD + R disc in ascending order from the beginning. If it is determined in step 48 that a read error has occurred, the current session is determined as the last session in step 51 and the session is determined. The recorded capacity and the number of sessions are determined and stored in the nonvolatile memory, the buffer memory or the memory of the controller in association with the volume name. In step 52, the start address and end address of the session, the recorded capacity, the number of sessions, etc. Is returned to the host computer, and the process is terminated in step 53 to shift to a command waiting loop process.
With this, even if the same DVD + R disc comes in next time, the latest information is updated, so that the trouble is minimized. By overwriting and updating the same volume name, the memory usage can be reduced.
[0066]
In this manner, an optical disk recording / reproducing apparatus compatible with a DVD + R multi-session disk can be made without changing the optical disk reproducing apparatus such as a conventional optical disk recording / reproducing apparatus so much. Further, even a device for reproducing an optical disk already operating in the market can reproduce a DVD + R disk of a multi-session disk only by changing the control program. Further, if the control program is stored in the nonvolatile memory as described above, it is easy to upgrade the version. Therefore, low cost and an effect of not wasting the apparatus can be expected.
[0067]
In order to recognize a multi-session DVD + R disc, the start and end addresses of each session are grasped to determine the last session, but the volume name of the previously inserted DVD + R disc is stored and its disc ID is stored. Since disk information is stored in correspondence with the above, at least one session recognition operation is sufficient, so that even if the number of sessions is large, it is not necessary to perform many seek operations, the mounting time is short, and high-speed mounting can be expected. Therefore, there is an effect that the mounting delay can be avoided even a little to make a comfortable use environment.
[0068]
In the above-described processing, when the disc ID cannot be obtained from the DVD + R disc, the volume ID may be used.
For example, if the disc ID in the lead-in area of the first session cannot be read in the process of step 23 in FIG. 3, the data area of the first session is further searched to read the volume name in the data area. To replace the disk ID.
In this way, if the disc ID of the DVD + R disc cannot be read, the volume name in the user data area can be used instead of the disc ID.
[0069]
If the volume name in the data area of the first session cannot be read out in the process of step 43 in FIG. 4, the lead-in area is further searched, and the disk ID in the lead-in area is read to read the volume name. Substitute for
In this way, when the volume name of the DVD + R disc cannot be read, the disc ID in the lead-in area can be used instead of the volume name.
Furthermore, if both the disk ID and the volume name are used, the disk can be determined more reliably. As a result, an effect that serves as an alternative means and an auxiliary means and contributes to improvement in reliability can be obtained.
[0070]
Also, in the above-described processing, a case has been described in which a DVD + R disc on which data is recorded by the multi-session recording method is reproduced. However, the same applies to a DVD-R disc and a DVD-RW disc of the multi-session recording method. it can. The DVD-R disc and the DVD-RW disc are different from the DVD + R disc in that each session has a lead-in area. However, when the above-described processing is applied to the DVD-R disc and the DVD-RW disc, the above-described processing is performed. A recording section corresponding to a session becomes a track, and information such as a start address, an end address, and a recorded capacity of the track becomes track information.
[0071]
【The invention's effect】
As described above, according to the information reproducing apparatus of the present invention, it is possible to correctly reproduce information on an information recording medium on which information is recorded by a multi-session recording method.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an optical disc recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram simply showing a multi-session format of a DVD + R disc on which data is recorded by a multi-session recording method.
FIG. 3 is a flowchart showing a process according to claims 1 and 2 of the present invention in the optical disk recording / reproducing apparatus shown in FIG. 1;
FIG. 4 is a flowchart showing a process according to claims 1, 2 and 3 of the present invention in the optical disc recording / reproducing apparatus shown in FIG.
FIG. 5 is a flowchart showing a process according to claims 1, 2 and 4 of the present invention in the optical disc recording / reproducing apparatus shown in FIG.
[Explanation of symbols]
1: Motor 2: Optical pickup
3: Coarse motor 4: Rotation control system
5: Coarse motor control system section 6: Optical pickup control system section
7: Signal processing system section 8: Buffer memory
9: Non-volatile memory 10: CPU / controller
11: External interface 12: Host computer
13: Optical disk 20: Session
21: Lead-in area 22: Fragment
23: Closure area 24: Intro area
25: Lead-out area

Claims (4)

When information is recorded from an information recording medium recorded in a recording section unit composed of one recording block or a recording block group composed of a plurality of recording blocks and having one or more recording sections, the information recording is performed. Means for reproducing the information of the recording section management section recorded at the head of the recording section of the medium, and obtaining a start address and an end address of the recording section;
Means for checking whether there is a recording section subsequent to the recording section reproduced by the means,
When it is confirmed by the means that there is a subsequent recording section, the information of the recording section management section recorded at the head of the subsequent recording section is reproduced, and the head address and the last address of the recording section are obtained. When,
Until it is confirmed by the means that there is no subsequent recording section, the recording section management sections of all the recording sections recorded on the information recording medium are sequentially reproduced, and the last address of the recording section recorded last. Means for obtaining a recorded capacity for the information recording medium and a start address and an end address of a last recording section for the information recording medium. The information reproducing apparatus according to claim 1,
The means for confirming whether or not there is a recording section subsequent to the reproduced recording section reproduces an address obtained by adding a predetermined value to the last address of the immediately preceding recording section, and proceeds when no reproduction error occurs. An information reproducing apparatus, comprising: means for confirming that a recording section exists, and for confirming that a subsequent recording section does not exist when a reproduction error occurs. The information reproducing apparatus according to claim 1,
Means for storing the start address and the end address of the recording section in association with the identification information of the information recording medium,
When the information recording medium is inserted, the identification information of the information recording medium is detected, and from the stored identification information, the start address and the end address of the last recording section corresponding to the identification information corresponding to the detected identification information. An information reproducing apparatus, comprising: means for acquiring an address. The information reproducing apparatus according to claim 1,
Means for storing a start address and an end address of the recording section in association with a disc ID of the information recording medium;
When the information recording medium is inserted, the disk ID of the information recording medium is detected, and the head address and end of the last recording section corresponding to the disk ID corresponding to the detected disk ID are detected from the stored disk ID. An information reproducing apparatus, comprising: means for acquiring an address.

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