JPH0437501B2 - - Google Patents

Abstract

PURPOSE:To prevent vanishing of data by double writing, realize write protection, and make stable reproduction of data by writing a specified signal doubly in the address section of a sector recorded data of which is to be protected. CONSTITUTION:When recording dsta 12, a directory 6 determines a recordable sector and sends write address 13 being the sector address, to a comparator 7 and an address adding circuit 14. The circuit 14 adds the address 13 to the data 12, and sends out write data 15. Reproduced address 22 obtained from the address section 1 of the sector by a recording and reproducing section 10 is compared with the address 13 by a comparator 7, and when they coincide, a record trigger signal 17 is sent out. Thereby, an encoder 8 makes coding of data 15 for error control, and supplies encoded data 16 to a recording section 2. When recorded data are to be protected, the recording and reproducing section 10 makes double writing in the address section 1 and destructs address data in the address section 1 to make the address section 1 impossible to reproduce.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an information recording/reproducing device for recording or reproducing information on a recording medium having an information recording area divided into a plurality of sectors.
For example, it relates to optical disk file devices and magnetic disk file devices.

Conventional configuration and its problems In an information recording and reproducing device that records and reproduces information in sector units, it is necessary to be able to record information in the correct sector and reproduce it from the correct sector. Furthermore, recorded information must be able to be reproduced. Therefore, in conventional information recording and reproducing devices, sector addresses are confirmed using methods such as providing an address section at the beginning of a sector, or counting sector separation signals inserted between sectors to obtain the sector address. ing. However, the signal that generates the sector address is generally short in time;
There was a problem in that effective error control could not be performed, and it was necessary to ensure sufficient reliability in the address part. In addition, as a countermeasure, the address is recorded in the data recording section, which is generally more reliable than the address section of the sector, and when playing back the sector at the address indicated by the directory, the A method was proposed to prevent the loss of information by referring to the recorded address (Japanese Patent Application No. 58-62438), and this proposed method was highly effective in preventing data loss due to inability to identify sector addresses. It has been obtained.

However, when recording, when reproducing the address part and comparing it with the sector address to be recorded,
If the address obtained by reproducing the address part of a recorded sector is mistakenly the address of an unrecorded sector, there is a possibility that further data will be written to the recorded sector. In this case, data in the double-written sector will be destroyed. There is a problem of data destruction due to such double writing, and a means to prevent double writing has become necessary in order to improve data reliability.

In addition, as the recording capacity of recording media increases, a single recording medium is used jointly by many users, and as device operation methods become more complex, it has become possible for other users to There has been a demand for a device having a means to protect the user from loss of data due to erroneous operation of the device, or in other words, a device having a write protection means.

Purpose of the invention The present invention solves the above-mentioned conventional problems.
The purpose is to prevent data loss due to double writing, achieve write protection, and provide stable data playback.

Structure of the Invention The present invention provides a recording medium having a sector structure in which an information recording area is divided into a plurality of sectors, and each sector has an address section in which an address signal is recorded in advance and a data recording section for recording data. It has a recording and reproducing means for recording and reproducing a signal on a medium, and the recording and reproducing means includes a means for adding and encoding a sector address for recording this data in the data to be recorded, and a means for adding and encoding a sector address for recording this data in the data to be recorded, and a means for adding and encoding a sector address for recording this data in the data to be recorded. Information comprising overwriting means that overwrites a predetermined signal to make the sector address in the address part unreproducible, and the overwriting means overwrites the predetermined signal in the address part of the sector in which recorded data is to be protected. It is a recording/playback device.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 is a diagram showing an example of a recording format of an optical disk used in an optical disk file apparatus in an embodiment of the present invention.

In FIG. 1, 1 is an address section, 2 is a data recording section, 3 is an address mark, 4 is a sector address section, and 5 is a CRC section. Each sector is composed of an address section 1 and a data recording section 2, and the address section 1 consists of an address mark 3 indicating the start of the address section, a sector address section 4, and a CRC section 5 that is a check for the sector address section. If the address is n, address part 1 of the nth sector
A sector address n is recorded in advance by initial formatting or the like before recording/reproducing.

Figure 2 is a block diagram of an embodiment of an apparatus for recording information on an optical disk having the recording format shown in Figure 1, and Figure 3 shows data recorded by the recording apparatus as shown in Figure 2. FIG. 2 is a block diagram of a device for reproducing .

In Figure 2, 6 is a directory, 7 is a comparator, 8 is an encoder, 9 is a modulation circuit, 10
19 is an optical pickup, 11 is a recording/reproducing unit,
is an optical disk.

The directory 6 is composed of a CPU and the like, and is a circuit that determines sector addresses.

Now, when trying to record certain data 12,
The directory 6 determines the sector that can be recorded and sends the write address 13, which is the sector address, to the comparator 7. Directory 6 also sends write address 13 to address addition circuit 14 . The address adding circuit 14 adds a write address 13 to the data 12, and writes the write data 1
Send 5. A comparator 7 compares the read address 22 obtained from the address section 1 of this sector by the recording/playback section 10 and the write address 13, and sends out a recording trigger signal 17 when they match. The encoder 8 that has received the recording trigger signal 17 encodes the write data 15 for error control. The encoded data 16 output from the encoder 8 is then recorded in the data recording section 2.

When it is desired to protect the recorded data, the recording/reproducing section 10 performs double writing to the address section 1 and destroys the address data in the address section so that the address section 1 becomes unreproducible.

However, if the comparator 7 does not detect a match between the read address 22 and the write address 13, the comparator 7 sends a sector non-detection signal 18 to the directory 6. Normally, increasing numbers are used for sector addresses of consecutive sectors, so
In the process in which the recording/reproducing head sequentially reads the address part 1 of each sector in order to search for the target sector, the reproduction address 22 becomes the write address 13.
If the recording trigger signal 17 is not generated until it becomes larger, the sector not detected signal 18 is generated. The directory 6 determines a new write address 13 by setting the sector of the write address 13 at the time of receiving the sector non-detection signal 18 as a bad sector.

If directory 6 is write address 13
If you specify a sector that has already been protected as will not be written and the data will be protected.

Note that the following method is available as an example of overwriting so that the address part 1 of the sector becomes unreproducible.

(1) Overwrite the entire address section 1 (Figure 1a).

(2) Overwrite address mark 3. (1st
Figure b).

(3) Overwriting is performed so that an error smaller than the length of the CRC section 5 occurs so that a CRC error occurs (Fig. 1c).

Further, the overwriting signal may be a DC signal or any other signal that satisfies the condition that the address of this sector cannot be read.

In addition, there are other ways to write:
Various methods are possible.

Next, the time of reproduction will be explained. In FIG. 3, 20 is a decoder, 21 is a demodulation circuit, and 27 is an output register. When it is desired to read and output a particular sector, the directory 6 sends the address of that sector to the comparator 7 as a read address 24. The recording/reproducing unit 10 reproduces the address part 1 of the sector and performs a rough search for the target sector. Then, the reproduced data 29 obtained by reproducing the data recording section 2 of the sector near the target sector and demodulating it by the demodulation circuit 21 is sent to the decoder 20. The decoder 20 decodes the reproduced data 29 and generates the decoded data 26 and the data address 28.
are sent to the output register 27 and comparator 7, respectively. The comparator 7 compares the read address 24 and the data address 28, and outputs an output trigger signal 25 when they match. In response to the output trigger signal 25, the output register 27 outputs the stored decoded data 26 as output data 23. On the other hand, if the read address 24 and the data address 28 do not match in the comparator 7, the decoded data 26 stored in the output register 27 is ignored, and the reproduced data 29 of the next sector is ignored.
Import and perform the same operation. In this way, it is possible to start outputting at the same time as the close search for the target sector ends.

The above-mentioned optical disk file device enables sector-by-sector write protection and high-speed searches by protecting only the data to be protected and searching for the target sector by combining coarse and fine searches. be able to.

In this example, a search is performed using a combination of a coarse search and a fine search, but addresses are searched only by a fine search, and all address parts of sectors that have already been written are made unreproducible to prevent double writing. Needless to say, it's a good thing.

According to the present invention, recording cannot be performed unless the address part is readable, and by providing means for referring to the sector address written in the data during playback and making the address part unreadable, writing to that sector is achieved. The feature is that it has a means to protect the data that has been written.

In addition, it goes without saying that the present invention is not limited to the embodiments described above and illustrated, and that various modifications and applications can be made without departing from the gist of the invention.

Effects of the Invention The information recording and reproducing apparatus of the present invention includes a means for adding and encoding a sector address for recording this data in the data to be recorded, and a means for overwriting a predetermined signal in the address part of the sector and addressing the address. By providing a means to make the sector address of the data unreproducible, it becomes possible to prevent data from being erroneously re-recorded in the sector to be protected, which has great practical value.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of the recording format of an optical disk used in an optical disk file device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a recording system of the optical disk file device according to the same embodiment. FIG. 3 is a block diagram showing the reproduction system of the same embodiment. 1...address section, 2...data recording section, 3...
...Address mark, 4...Sector address part, 5
...CRC section, 6...Directory, 7...Comparator, 8...Encoder, 9...Modulation circuit,
10...recording/reproducing section, 11...optical disk, 19
...Optical pickup, 20...Decoder, 2
1... Demodulation circuit, 27... Output register.

Claims (1)

[Claims] 1. Recording and reproducing signals on a recording medium having a sector structure in which an information recording area is divided into a plurality of sections, and each sector has an address section in which an address signal is recorded in advance, and a data recording section for recording data. The recording and reproducing means includes a means for adding and encoding a sector address for recording this data in the data to be recorded during recording, and a means for overwriting a predetermined signal in the address part of the sector. An information recording and reproducing device comprising overwriting means for making a sector address in an address part unreproducible, the overwriting means overwriting a predetermined signal in the address part of a sector in which recorded data is to be protected.