JPS613369A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent vanishing of data due to impossibility of distinguishing of sector addresses when reproduced address signal does not coincide with a record address by doubly writing a specified signal on the address section, and making reproduction of the address section impossible thereafter. CONSTITUTION:A recording and reproducing section 10 reads successively the address section 1 of a sector by an optical pickup 24, and when a relevant sector is found, reproduces the address section 1 of the sector lowering reproduction sensitivity by changing the level of binary coding, and sends the sector address 14 to a comparator 7. The comparator 7 compares the reproduced address 14 with a written address 13, and in case of dissidence, sends a signal 18 to a directory 6 and a new write address 13 is determined. Cosequently, the recording and reproducing section 10 returns reproduction sensitivity to the original state, retrieves the relevant sector, writes doubly a specified signal on the address section, and makes the address section 1 impossible to reproduce.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an information recording/reproducing apparatus for recording or reproducing information on a recording medium having an information recording area with a sector structure divided into a plurality of sections. , relating 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. The recorded information must be able to be reproduced. Therefore, in conventional information recording and reproducing devices, an address section is provided at the beginning of a sector, a sector separation signal between sectors is counted, and a sector separation signal is counted. Sector addresses are confirmed using methods such as obtaining the addresses of the sectors. However, there is a problem in that the signal for generating the sector address is generally short in time and 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, and prevents data loss due to inability to identify sector addresses.
An object of the present invention is to provide an information recording/reproducing device that can perform stable data reproduction.

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. A recording and reproducing means for recording and reproducing a signal 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 level changing means changes the level. The address is detected from the playback address signal by lowering the playback sensitivity, 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. This is an information recording and reproducing device configured so that it cannot be reproduced.

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

In FIG. 1, 1 is an address section, 2 is a data recording section,
3 is address mark, 4 is sector address part, 5 is CR
This is part C. Each sector is composed of an address section 1 and a data recording section 2, and the address section 1 includes an address mark 3 . Sector address section 4.
If the sector address of the n-th sector is n, the sector address n is recorded in the address part 1 of the n-th sector by initial formatting etc. before recording and reproduction. ing.

FIG. 2 is a block diagram of an embodiment of an apparatus for recording information on an optical disk having the recording format shown in FIG. 1, and FIG. FIG. 2 is a block diagram of a reproduction device.

In FIG. 2, 6 is a directory, 7 is a comparator, 8 is an encoder, 9 is a modulation circuit, 10 is a recording/reproducing section,
24 is an optical pickup, and 11 is an optical disc.

The directory 6 is composed of a CPU and the like, and is a circuit that determines sector addresses. When trying to record certain data 12, the directory 6 determines the sector that can be recorded and writes the write address 13 that is the sector address.
is sent to comparator 7. The directory 6 sends the write address 13 to the recording/reproducing section 1Q. Recording and playback section 1
0 controls the optical pickup 24, sequentially reads the address part 1 of the sectors, and searches for the sector corresponding to the write address 13. When the recording/reproducing unit 10 finds a corresponding sector, it reproduces the address part 1 of the sector by changing the binarization level to lower the reproduction sensitivity, and sends the sector address 14 to the comparator 7. Further, if the corresponding sector cannot be found, the recording/reproducing unit 1o sends an end-of-sector detection signal 15 to the directory 6.

The directory 6 sets the sector of the write address 13 at the time of receiving the sector end detection signal 15 as the heart sector,
A new write address 13 is determined.

When the corresponding sector is found, the comparator 7 changes the binarization level sent to the recording/reproducing unit 10 and compares the reproduced sector address 14 with the write address 13, and when they match, sends the nef'JA trigger signal 16. The encoder 8, which receives the recording trigger 1.delta.-key 16, performs the error-control 1 error encoding on the data 12. Then, modulate the encoded data 1 output from the encoder 8,
The data is recorded in the data recording section 2. On the other hand, when the sector address 14 reproduced by changing the binarization level and the write address 13 do not match, the comparator 7 (ri) sends a mismatch signal 18 to the directory 6. A new write address 13 is determined, and a rewrite signal 19 is sent to the recording/reproducing section 1o.

Upon receiving the rewrite signal 19, the recording and reproducing section 1o 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) CRCR2O3 so that a CRC error occurs
Overwrite so as to make an error of less than or equal to (Figure 1 C)
.

1, 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.

Note that in addition to this, various methods of overwriting 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 sent to the decoder 2.
0 is output 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, data is transferred to a sector with a stable address part. This makes it possible to record data only in the 2nd digit, making it possible to play back data stably.

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 playback of data becomes possible, which has a great practical effect.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of the recording format of an optical disc used in an optical disc file device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a recording system of the optical disc file device according to the embodiment. FIG. 3 is a block diagram showing the reproduction system of the same embodiment. 1...Mockery...Address section, 2...Data recording section, 3-----Address mark, 4 mamms-
Sector address section, 6...Φ...CH2 section, 6■...
・e directory, 7-... comparator, 8.
...Fist en: +-ta, g...Modulation circuit, 1
o...Self-recording and reproducing section, 11...+10 optical, disk, 2o...--decoder, 21...-demodulation circuit, 24...-optical pickup.

Claims (1)

[Claims] A signal is recorded and reproduced on a recording medium having a sector structure in which an information recording area is divided into a plurality of parts, and each sector has an address part in which an address signal is recorded in advance, and a data recording part for recording data. a recording and reproducing means;
and level changing means for changing the binarization level when detecting an address from the reproduced address signal, and when recording, the level changing means lowers the reproduction sensitivity by changing the level and detects the address from the reproduced address signal. The information recording and reproducing apparatus is configured to compare the detected address with the address to be recorded, and when they do not match, overwrites the address section with a predetermined signal so that the address section cannot be reproduced thereafter.