JPH0462431B2 - - Google Patents

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 apparatus 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 by methods such as providing an address section at the beginning of a sector, or counting sector separation signals between sectors to obtain the sector address. However, the signal that generates the sector address is generally short in time, and there is a problem in that effective error control cannot be performed, so it is necessary to ensure sufficient reliability in the address section.

Purpose of the invention The present invention solves the above-mentioned conventional problems.
It is an object of the present invention to provide an information recording and reproducing device that can prevent data loss due to inability to identify sector addresses and can stably reproduce data.

Composition 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. A recording and reproducing means for recording and reproducing signals on a medium, and a level changing means for changing a binarization level when detecting an address from a reproduced address signal, and when recording,
The playback sensitivity is lowered by changing the level with the level change means, the address is detected from the playback address signal, the detected address is compared with the address to be recorded, and if they do not match, a predetermined value is set in the address section. Overwrite the signals, and then
This information recording and reproducing apparatus is configured so that this address part cannot be reproduced.

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 device 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
11 is a recording/reproducing section, 24 is an optical pickup,
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 a certain data 12 is to be recorded, the directory 6 determines a recordable sector and sends the write address 13, which is the sector address, to the comparator 7. The directory 6 also sends the write address 13 to the recording/reproducing section 10. The recording/reproducing unit 10 controls the optical pickup 24 and sequentially reads the address part 1 of the sector.
A sector corresponding to write address 13 is searched. When the recording/reproducing unit 10 discovers the corresponding sector,
The address part 1 of the sector is reproduced with the reproduction sensitivity lowered by changing the binarization level, and the sector address 14 is sent to the comparator 7. Further, if the corresponding sector cannot be found, the recording/reproducing unit 10 sends the sector end detection signal 15 to the directory 6.
send to Directory 6 is sector end detection signal 15
The sector at write address 13 at the time of receiving the write address is regarded as a bad sector, and the sector at the new write address 1 is set as a bad sector.
Decide on 3.

If the corresponding sector is found, comparator 7
compares the sector address 14 reproduced by changing the binarization level sent from the recording/reproducing section 10 and the write address 13, and sends out a recording trigger signal 16 when they match. The encoder 8 that receives the recording trigger signal 16 encodes the data 12 for error control. The encoded data 17 output from the encoder 8 is then modulated and recorded in the data recording section 2. On the other hand, sector address 14 and write address 13 reproduced by changing the binarization level
do not match, comparator 7 outputs mismatch signal 1
8 to directory 6. Upon receiving the mismatch signal 18, the directory 6 regards this sector as a bad sector, determines a new write address 13, and sends a rewrite signal 19 to the recording/reproducing section 10. Upon receiving the rewrite signal 19, the recording/reproducing section 10 returns the reproduction sensitivity to the original value, searches for the corresponding sector again, and overwrites the address section of the corresponding sector with a predetermined signal.

As an example of overwriting so that the address part 1 of the sector becomes unreproducible, there is the following method.

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

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

(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, as for the method of overwriting,
Various methods are possible.

Next, the time of reproduction will be explained. In FIG. 3, 20 is a decoder and 21 is a demodulation circuit. When a specific sector is to be read and output, the directory 6 sends the address of that sector to the recording/reproducing unit 10 as a read address 22. The recording and reproducing section 10 reproduces the data recording section 2 of the sector corresponding to the read address 22 with normal reproduction sensitivity, and the reproduced signal is demodulated and then outputted from the decoder 20 as output data 23.

As described above, according to the embodiment of the present invention, during recording, the address part is reproduced with the reproduction sensitivity lowered, and compared with the sector address to be recorded. When a sector is detected, a predetermined signal is overwritten in the address part so that the address part of the sector becomes unplayable, and by making it impossible to write to this sector from now on, the data is transferred to a sector with a stable address part. This enables stable data reproduction.

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 During recording, the information recording/reproducing apparatus of the present invention reproduces the address part by lowering the reproduction sensitivity by changing the level of binarization, and detects sectors in which the address part is unstable. It becomes possible to record data only in sectors where the data is stable, and stable reproduction of data becomes possible, which has a great practical effect.

[Brief explanation of the drawing]

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, 20
... Decoder, 21 ... Demodulation circuit, 24 ... Optical pickup.

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. and a level changing means for changing a binarization level when detecting an address from a reproduction address signal, and when recording, the level changing means changes the level to lower the reproduction sensitivity and reproduce. The structure is such that the address is detected from the address signal, the detected address is compared with the address to be recorded, and if they do not match, a predetermined signal is overwritten on the address part, and this address part cannot be reproduced from now on. Information recording and reproducing device.