JPS62170077A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain the sector substitute processing in the shortest time by applying a defective sector marking to a data field part of a defective sector and a sector identifier. CONSTITUTION:A CPU 3 commands the seek of an object sector of an optical disk 1 to a drive 2. When the object sector is detected, the defect of a reproducing signal 103 of the sector is checked by a detection signal 104 of a dropout detection section 8. When a defective sector exists, the drive 2 writs the 1st signal 107 to the data field part of the sector. Then the CPU 3 writes the 2nd signal 108 just above a sector identifier of the object sector. In reading a data of an optical disk having a defective mark sector, when the 1st signal 11 is detected and the 1st signal detection section 11 outputs the signal 111 to the CPU 3. The CPU 3 recognizes the sector as the defective sector mark sector from the signal 111 to read the data from the substitute sector.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to alternative recording of defective sectors in an information recording and reproducing apparatus that records and reproduces information on a recording medium having an information recording area with a sector structure divided into a plurality of sectors, and the defect prevention method. This relates to recording sector identification signals.

2. Prior Art As a conventional information recording/reproducing device, for example,
Japanese Patent Application Laid-Open No. 113-203634 discloses a method of fully determining the quality of recording and recording a flag at the end of the sector if it is defective, and Japanese Patent Application Laid-Open No. 113509-1987 discloses a disk device for replacing defective sectors.

FIG. 13 shows the sector format of these conventional disks, and shows the bad sector identification flags F1. This shows F2.

A sector has a sector identifier ID, a data field part DF, and a flag part F1 that records the use status of the data field part DF. Consists of F2. Figure 13 is sector identifier I
This is an example in which flag F1 is recorded immediately after D, and FIG. 13 is an example in which flag F2' (5 flags are recorded at the end of data field DF).

Flags F1 and F2 indicate D RAW (Direct Read) during data recording to the data field section DF.
Based on the result of the AfterWrite) check or the read verification check after recording, a flag F1. Record as F2.

Another method is to check the quality of the data field section DF in advance and record the result in the flag F1 or F2. The former is applied to write-once optical discs, and the latter is applied to erasable optical discs and magnetic discs.

FIG. 13a shows that when an uncorrectable error is detected in the recorded data as a result of the DRAW check, a flag F1 is written in the next rotation of the disk.

In FIG. 13, flag F2 is written immediately after data recording. Therefore, the processing shown in FIG. 13 is faster. When reproducing data, the data is discarded upon detection of flag F1 or F2.

Problems to be Solved by the Invention However, in the above configuration, the flag F1,
F2 has a problem in the reliability of detection in recording media such as optical discs, which have many defects such as foreign matter in the base material, scratches on the disc surface, and dust on preformatted tracks. Furthermore, if the recording area of these flags is increased in order to make the recording medium more resistant to defects, there is a problem in that the storage capacity of the recording medium is reduced.

The present invention is capable of detecting defective sectors not only in the data field part DF but also in the sector identifier ID with high reliability in real time during data recording or data reproduction, and as a result, replacement processing for the defective sectors can be performed in a short time. The purpose is to provide an information recording and reproducing device that can perform the following operations.

Means for Solving Problems The present invention provides a bad sector detection means for fully determining whether a sector is good or bad;
Means for completely recording a first signal having sector alternative information having a signal component having a lower frequency than the data modulation signal in the data field part DF, an address on the sector ID identifier part ID in which track addresses, sector addresses, etc. are recorded. means for recording a second signal that obscures the entire signal;
The information recording and reproducing apparatus includes means for detecting the first signal and means for substituting a defective sector with a sector at another position.

According to the present invention, with the above-described configuration, the bad sector detection means detects a sector in which an ID information reading error has occurred in the sector identifier ID of the sector, a sector in which the data field DF has a dropout exceeding a predetermined standard, or a sector that can be erased. Test data is recorded on a suitable recording medium and read by read verification, a sector in which a data error exceeding a standard has occurred is determined to be a bad sector, a first signal is written to the data field part DF of the sector, and then Second
The signal is overwritten on the sector identifier ID so that the sector ID signal of the sector cannot be read.

The sector in which the first signal and the second signal are written in this way will be hereinafter referred to as a sector with a defective sector mark.

If a sector with a bad sector mark is accessed during data recording, an error in reading the ID information will definitely occur because the sector identifier ID is overwritten with the second signal. Therefore, the sector cannot be detected and the laser beam from the optical head passes through the sector identifier ID and reproduces the data field DFi. As a result, the first signal recorded in the data field section DF is reproduced.

Upon detection of the first signal, the data of the sector is recorded in the alternative sector of the alternative sector area.

The alternative sector area is composed of an alternative sector provided on the same track as the defective sector and an alternative track provided at a predetermined location on the disk for relieving overflow of the alternative sector. The first signal has location information of the alternative sector.

When reading data, if a sector with a bad sector mark is accessed, an error occurs in reading the ID information because the sector identifier ID is overwritten with the second signal. Therefore, the sector cannot be detected, and the laser beam from the optical head passes through the sector identifier ID and reproduces the data field portion DF. As a result, the first signal recorded in the data field section DF is reproduced. By detecting this first signal, it is known that the sector in question is recorded in an alternative sector, and the position of the alternative sector is determined from this first signal and the alternative sector is read.

In this way, since defective sectors can be detected in real time during data recording and data reproduction, replacement processing for defective sectors can be performed in the shortest processing time.

Embodiment FIG. 1 shows a block diagram of an information recording and reproducing apparatus in an embodiment of the present invention. In FIG. 1, 1 is an optical disk having a preformatted track consisting of a plurality of sectors, 2 is a predetermined track of the optical disk 1, and a laser beam of an optical head is focused on the searched track. A drive section 3 performs focus/tracking servo to precisely follow the signal and records/reproduces signals; 3 is a track seek command for the drive section 2;
A microcomputer CPU controls system operations such as controlling the writing of the first signal, detecting the first signal, and controlling sector replacement; 4 adds an error detection and correction code such as a Reed Solomon code to the input data 100; Then, MFM modulation (2, 7)
RL L C (Run Length Lim1te)
dCode ) modulation, etc., a data modulation section that digitally modulates a signal matching the recording and reproduction characteristics of the recording medium of the optical disc 1; 6 is a clock pulse f P from the reproduction signal 103;
L O (Phase Locked Loop Osci)
1ator) circuit, takes the reproduced signal 103 into a shift register, and demodulates the data by converting the output of the shift register with a combinational circuit. (2,7) The data modulation section and data demodulation section of RLLC are described in USP 4 by Eggenberger et al.
No. 115, 768 (5ept, 19.1978).

6 is a track address, a sector address, and a CRCC code for error checking (Cyclic Redundancy).
An address reading unit reads the track address and sector address from the sector identifier ID that records ID information such as cyCheck Code) and performs an error check using CRCC. 7 is the target address 101 from the CPU 3
8 is a sector address comparison unit that detects the position of a laser beam on a track for data recording, reproduction, dropout detection, etc. by comparing the read address 102 of the address reading unit 6; 9 is a CPU 3 that binarizes the playback signal 103 of the optical disc 1 at a predetermined clipping level (for example, 6a% of the playback signal amplitude of the sector identifier of the playback signal 103) and detects a dropout that exceeds the clipping level; 10 is a first signal generating unit that generates a first signal in response to a write command 105 from the CPU 3 and outputs the first signal to the drive 2;
A second signal generating section 11 detects the first signal recorded in the data field section and outputs the second signal to the drive 2 in response to the signal write command 106.
12 is the first signal detection unit that notifies the reproduced signal 103.
This is an error correction section that demodulates the data in the data demodulation section 6 and corrects errors occurring in the data on the optical disc 1. 1
00 is the input data from the CPU (not shown) for recording on the optical disc, 101 is the target address of the sector for recording and reproducing the input data, 102 is the read address from the optical disc 1 after reading by the drive 2, 103
is the playback signal read from the optical disc 1 by the drive 2,
104 is an optical disc dropout detection signal, 105
is the first signal write command, 106 is the second signal write command, 107 is the first signal, 108
is a second signal, 109 is a data modulation signal, 110 is a write sector gate that instructs the data modulator 4 to write a signal, 111 is a first signal detection signal, and 112 is a signal read operation to the data demodulator 5 113 is the output data read from the target sector to be transferred to the host CPU, 114 is the reproduction signal 10
This is an error flag indicating the occurrence state of an error such as a 1-symbol error or a 2-symbol error derived from the error correction code of the data demodulated by the data demodulating section 5.

FIG. 2 is a signal waveform diagram illustrating the recording operation of the first signal 107 and the second signal 108 in marking a defective sector. FIG. 2a shows a reproduced signal 103, in which sectors So, S1 and S2 are composed of a sector identifier ID, a data field part DF, and a gap part between the sector identifier ID and data field part DF. There is a dropout DO in sector S1. FIG. 4 shows an example of the sector identifier ID.

Fig. 4 is a diagram showing the recording positional relationship between the sector identifier ID and the second signal 108, in which Fig. 4a shows the sector identifier ID;
SM is a sector mark indicating the beginning of a sector, PR is a preamble for reproducing the clock of the sector identifier ID,
AM is an address mark to indicate the beginning of ID information.
TA is track address, SA is sector address, CR
CC is a cyclic code for error detection, PO is a postamble for making it easier to reproduce ID information like the preamble, and FIG. 4 is a second signal 108.

FIG. 3 is an embodiment of a flowchart for marking a defective sector on a write-once optical disc.

The operation of the information recording/reproducing apparatus of this embodiment configured as described above will be described below.

First, the operation of marking a defective sector, which is performed to check the quality of a predetermined sector before recording on the optical disc 1, will be explained.

(1) The CPU 3 instructs the drive 2 to seek the target sector of the optical disk 10. Drive 2 seeks the target sector.

(2) The CPU 3 reads the read address signal 102 from the address reading section 6 and checks whether it is the target sector.

(3) When the target sector is detected, the dropout detection signal 104 of the dropout detection unit 8 is used to check the reproduction signal 103 of the sector for defects. The dropout detection unit 8 is composed of a comparator circuit that receives as a comparison input a clipping level set to about 50 degrees of the amplitude of the reproduced signal 103 of the sector identifier ID, detects a signal exceeding the clipping level as a dropout, and detects the dropout. It is output as a detection signal 104.

(3a) CPU3 sends dropout detection signal 104
The total number and length of dropouts are compared with a predetermined standard, and if the total number and length of dropouts are greater than the standard, the sector is determined to be bad.

(3b) In the case of a bad sector, the CPU 3 instructs the drive 2 to seek the target sector again.

(3c) The CPU 3 reads the read address signal 102 of the address reading unit 6 and determines that it is the target sector.
A first signal write command 105 is output to the first signal generator 9, and the drive 2 writes the first signal 107 to the data field section DF of the target sector.

(3d) While reading the read address signal 102 of the address reading section 6, the CPU 3 seeks the sector at the sector address of the target sector address - 1 sector.

(3e) After measuring the time until the sector identifier ID of the target sector, the CPU 3 records the second signal 108 directly above the sector identifier ID of the target sector. CPU
3 outputs the second signal write command 106 to the second signal generating section 1o, and the drive 2 writes the second signal 108 to the sector identifier ID of the target sector.

(4) If the target sector cannot be detected, the CPU 3 reads the address and uses the read address signal 102 of the read section 6.
While reading, seek the sector at the sector address of the target sector address - 1 sector.

(4a) After measuring the time to the data field DF of the target sector, the CPU 3 records the first signal 107 in the data field DF of the target sector.

(4b) While reading the read address signal 102 of the address reading section 6, the CPU 3 seeks the sector at the sector address of the target sector address - 1 sector.

(4c) After measuring the time until the sector identifier ID of the target sector, the CPU 3 records the second signal 108 directly above the sector identifier ID of the target sector.

(s) The CPUa performs checking while updating the address of the target sector until a predetermined number of sectors have been checked.

FIG. 2 is a diagram showing how the first signal 107 and the second signal 108 are written when the sector S1 has a dropout DO and is a defective sector. FIG. 2a is a signal waveform diagram of an embodiment of the reproduction signal 103 of the optical disc 1 having a dropout Do in sector S1, and FIG. 2 is an example of the first signal 107. FIG. 1 signal 10
7, FIG. 2d is a signal waveform diagram of another embodiment of the first signal 107, and FIG. 2e is an enlarged signal waveform diagram of the second signal 107.
Signal waveform diagram of the embodiment of 0B, Fig. 2 f is the second signal waveform diagram of Fig. 2 e.
FIG. 2 q is a signal waveform diagram of another embodiment of the second signal 108, and the second diagram is a signal waveform diagram of the reproduced signal 103 after adding a bad sector mark. As shown in FIG. 2C or 2D, the first signal 107 has a total of three pulse trains recorded so that even if there is a dropout on the optical disc 1, it can be detected accurately. In FIG. 2 C9f, q, the symbols M, S, and RF are marks, spaces, and RF (Radio), respectively.

f is an RF multiplied signal with a frequency comparable to the frequency of the signal waveform of the sector identifier ID, and q in FIG. 2 is a signal having the same configuration as the first signal 107, and as shown in FIG. At least address mark AM, track address TA, sector address SA, and error check CR
This overwrites one of the CCs, making the address reading section 6 unable to read the address and causing a CRCC error.

By making the pulse widths of the marks M and spaces S sufficiently longer than the longest dot length of the data modulation signal 109 of the data field section DF, detection of the first signal is ensured as will be described later with reference to FIG.

FIG. 5 is a block diagram of the first signal generating section 9. As shown in FIG. 6th
In the figure, 13 is a decoder that decodes the first signal write command 105, and 14 is a Motorola MCesso.
S A RT (5erialAsynchr
onous Data Receiver and T
18 is an AND gate. 115 is the output signal of the 5ART 14, 116 is the RF multiplied signal 11 is the output signal of the NAND gate 17, and 118 is the first signal enable signal.

FIG. 6 is a diagram showing signal waveforms at each part in FIG. 5.

In FIG. 5, the first signal write command 105 is decoded by the decoder 13, and data for setting the mark M and space S of the first signal is set in 5ART14.

Next, at the same time as the 5ART 14 is activated, the first signal enable signal 118 is outputted from the decoder 13. By doing this, the output signal 116 of 5ART14 becomes AN
It is gated with the RF signal 116 by the D gate 18 to generate a first signal 107. The second signal generator 10 generates the first signal enable signal 118 and the RF signal 11 shown in FIG.
6 and the first signal shown in FIG. 2f, and the data set in the 5ART 14 with the same configuration as in FIG. 5. Next, data recording will be explained.

Figure 7 shows optical disk 1 with bad sector markings.
2 is a flowchart when recording data. 8th
The figure is a diagram showing sector replacement recording of a sector with a bad sector mark. The operation of data recording will be explained using FIG.

(1) The CPU 3 requests input data 10o from the host CPU (not shown).

(2) When the CPU 3 receives the input data 100, it instructs the drive 2 to seek the target sector.

Drive 2 seeks the target sector.

(3) The CPU 3 sets the target address 101 in the sector address comparator 7 and outputs a sector recording command.

(4) When the target sector is detected, the sector address comparator 7 outputs the write sector gate 110 to the data modulator 4.

(5) The CPU 3 checks the recording busy status of the data modulation section 4 and waits for data recording to be completed.

The data modulation unit 4 adds an error correction code to the input data 100 and then digitally modulates the input data 100 to generate a data modulation signal 1.
Output to 09i drive 2. The drive 2 modulates the intensity of the laser beam using the data modulation signal 109 and records it on the target sector of the optical disc.

(6) If the recording busy status is not set and the first signal 111 is not detected even after the target sector is passed, the CPU 3 detects a timeout using the timer count and handles the error using timeout processing.

(7) The recording busy status is not set and the first
If the signal 111 is detected, the first signal detection unit 11
detects a first signal from the reproduced signal 103 and outputs it to the CPU 3 as a first signal detection signal 111. The CPUa learns from the first signal detection signal 111 that the sector in question is a sector with a defective sector mark, and determines the address of a sector to be replaced.

(a) The CPU 3 seeks the alternative sector again.

(9) The CPU 3 records input data in the alternative sector.

(1o) The CPU 3 records data while updating the address of the target sector until data recording for a predetermined number of sectors is completed.

FIG. 8 shows the waveforms of each signal when data is recorded in FIG. 2. Figure 8a shows optical disk 1 in drive 2.
The reproduced signal 1o3 in FIG. 8 is the first signal detection signal 11.
1. Figure 8C is a light sector game) 110. FIG. 8d shows the data modulation signal 109.

In FIG. 8, sectors So, S2. S3 is a normal sector, and sector S1 is a sector marked as a bad sector. The sector S1 has a second signal 108 as the sector identifier ID.
Since the sector identifier ID is overwritten, the address reading section 6 does not detect the sector identifier ID, and the laser beam of the drive 2 passes through the sector identifier ID. 1 signal 107
Detect. As a result of this detection, data D2 is recorded in the sector S1 in place of the alternative sector Sr provided on the same track. The above series of operations are processed in the first rotation of the optical disc 1, and in the second rotation, data D3. D4 is recorded, and sector replacement recording is performed in the shortest processing time.

FIG. 9 is a block diagram of the first signal detection section 11. FIG. 10 is a signal waveform diagram of each part in FIG. 9. In FIG. 9, 19 is a retrigger type monostable multivibrator, 2
o is AND gate, 21 is 5ART same as 14, 22
is the same baud rate generator as 16.

119 is the output of the retrigger type nest stabilizing multi-novel ibrator 19; 120 is the first signal detection enable signal; 121
is the output of the AND gate.

The operation of the block diagram of the first signal detection section 11 in FIG. 9 will be described below using the signal waveform shown in FIG. 10.

The reproduced signal 103 shown in FIG. 10A is detected by the retrigger type bellow as the output 119 in FIG. 10A. The first signal detection enable signal 120 specifies the second signal recording area of the data field section DF in order to improve detection accuracy. The output 119 of the retriggered monostable multivibrator 19 is AN at the first signal detection enable signal 120.
Signal 121 gated by D gate 20 and shown in FIG. 10d
Input into 5ART21. Signal 121 is 5ART as a serial signal like the asynchronous communication interface.
21 and is sampled and read out using clock pulses from the baud rate generator 22. 1st
As shown in Figure 0d, the first mark M and the last space S
function as the start bit St and stop bit Sp of 5ART21. The combination of the mark M and space S sandwiched between the start bit St and stop bit Sp records alternative data of the sector such as the sector address of the alternative destination.

FIG. 11 is an embodiment of a data read flowchart for reading data recorded on an optical disk having a sector with a defective sector mark.

Hereinafter, an operation for reading data recorded on an optical disk having a sector with a defective sector mark will be described.

(1) The CPU 3 instructs the drive 2 to seek the target sector. Drive 2 seeks the target sector.

(2) The CPU 3 sets the target address 101 in the sector address comparator 7 and outputs a sector read command.

(3) When the target sector is detected, the sector address comparator 7 outputs the read sector gate 112' (5-data demodulator 6).

(4) The CPU 3 checks the read busy status of the data demodulator 5 and waits for the data read to be completed. The demodulated data demodulated by the data demodulation unit 5 is corrected by the error correction unit 12 for data errors occurring on the optical disc 1, and the output data 113 is transmitted to the host CP.
Output to U.

(5) If the read busy status is not set and the first signal 111 is not detected even after the target sector is passed, the CPU 3 detects a timeout using a timer count and performs error handling using timeout processing.

(6) The read busy status is not set and the first
If the signal 111 is detected, the first signal detection unit 11
detects a first signal from the reproduced signal 103 and outputs it to the CPU 3 as a first signal detection signal 111. The CPU 3 learns from the first signal 111 that the sector is a sector with a defective sector mark, and determines the address of the sector in which the sector is being replaced.

(6a) The CPU 3 seeks an alternative sector.

(eb) CPU 3 reads data from the alternative sector.

(7) The CPU 3 requests the host CPU to output data and instructs the host CPU to prepare for receiving the next read data.

(8) The CPU 3 reads data while updating the address of the target sector until data reading for a predetermined number of sectors is completed.

As is clear from the above explanation of the data read operation, the position of the alternative sector can be immediately determined from the sector with the defective sector mark, so that high-speed data read can be performed.

FIG. 12 is an embodiment of a flowchart for marking a defective sector on an erasable optical disc.

The operation will be explained below with reference to FIG.

(1) The CPU 3 instructs the drive 2 to seek the target sector of the optical disc 1. Drive 2 seeks the target sector.

(2) The CPU 3 reads the read address signal 102 from the address reading section 6 and checks whether it is the target sector.

(3) When the target sector is detected, test data is written to the target sector for inspection.

(3a) The CPU 3 read-verifies the sector in which the test data has been written. Read verification is performed by setting the playback conditions of the drive 2 more strictly than the normal playback conditions. That is, the reproduced signal 10 from the optical disc 1
3, the clipping level is set to make dropouts more likely to occur, and the error correction unit 12 detects the error occurrence state of the demodulated data of the data demodulation unit 5.
In step 2, an error and drome is calculated, an error flag 114 is generated from the error flag 114, and when the error exceeds a predetermined standard by the CPU 3, the sector is determined to be a bad sector.

(3b) In the case of a bad sector, the CPU 3 instructs the drive 2 to seek the target sector again.

(3c) The CPU 3 reads the read address signal 1025 from the address reading section 6. If it is the target sector, a first signal write command 105 is output to the first signal generator 9, and the drive 2 writes the first signal 107 to the data field DF of the target sector.

(3d) The CPU 3 reads the read address signal 102 from the address reading section 6 and seeks the sector at the sector address of the target sector address - 1 sector.

(3e) CPU3 uses the sector identifier ID of the target sector
After measuring the time until
A second signal 108 is recorded directly above the signal. The CPU 3 sets the second signal write command 106 to the second
The drive 2 writes the sector identifier IDVCV2O3 No. 108 of the target sector.

(4) If the target sector cannot be detected, the CPU 3 reads the read address signal 102 of the address reading section 6 and seeks the sector at the sector address of the target sector address - 1 sector.

(4a) After measuring the time until the data field DF of the target sector, the CPU 3 records the first signal 107 in the data field DF of the target sector.

(4b) The CPU 3 reads the read address signal 102 of the address reading section 6 and seeks the sector at the sector address of the target sector address - 1 sector.

(4c) CPU3 uses the sector identifier ID of the target sector
After measuring the time until the end, a second signal 10B'ji7 is recorded directly above the target sector identifier ID.

(5) The CPU 3 performs checking while updating the address of the target sector until a predetermined number of sectors have been checked.

As described above, on erasable optical discs, sectors can be checked more accurately than on write-once optical discs by recording test data and checking error flags during playback.

Effects of the Invention As is clear from the above explanation, according to the present invention, by marking sectors with defects such as dropouts in the sector identifier ID and data field DF as bad sectors, redundant data can be eliminated during data recording and reproduction. Sector replacement processing is possible in the shortest time without waiting for rotation, sectors with defective marks can be detected reliably with a simple configuration, and the above first and second signals overlap in the data field. Since the optical disc is recorded using the same method, it provides an information recording and reproducing apparatus which does not take up the storage capacity of the optical disc compared to the conventional method using the Furano cave, and its practical effects are great. Note that although the present invention has been described using an optical disk as an example, it can also be applied to a magnetic disk and the like, and is not limited thereto.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an information recording and reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a signal waveform diagram of the same embodiment, FIG. 3 is a flowchart for checking bad sectors of a write-once optical disc, and FIG. 4 is a sector A diagram of the recording position relationship between the identifier and the second signal, FIG. 6 is a block diagram of the first signal generating section 9, FIG. 6 is a signal waveform diagram of each part of FIG. 5, and FIG. 7 is an optical disc with a bad sector mark. 8 is a signal waveform diagram of each part when data is recorded, FIG. 9 is a block diagram of the first signal detection unit 11, and FIG. 10 is a signal of each part in FIG. 9. Waveform diagram, Figure 11 is a flowchart for reading data from an optical disk with a bad sector mark, and Figure 12 is a 70-minute flowchart for checking bad sectors on an erasable optical disk.
- chart, 13th mat diagram. 1... Optical disk, 2... Drive section, 3... Microcomputer CPU, 4...
...Data modulation section, 6...Data demodulation section,
6... Address reading unit, 7... Sector address comparing unit, 8... Dropout detection unit, 9... First signal generating unit, 1o・・・・・・
...Second signal generation section, 11...First signal detection section, 12...Error correction section, 13...
・Decoder, 14, 21--5erial As
ynchronous DataReceiver a
nd Transmitter SA RT, 15
．． 22...Baud rate generator, 16...
...Inverter, 17...NAND gate, 18...AND gate, 19...Retrigger type monostable multivibrator, 20...
AND gate, ID...Sector identifier (ID)
Section, DF... Data field section, Fl, F2
... Flag section, 100 ... Input data, 101 ... Target address, 102 ...
...Read address, 103...Reproduction signal,
104...Dropout detection signal, 105.
...First signal write command, 107...
...First signal, 108...Second signal,
109...Data modulation signal, 110...
-Write sector gate, 111... River -First signal detection signal, 112...Read sector gate, 113
...Output data, 114...Error flag, 115...5 ART14 output signal,
116...RF multiplication signal 117...NA
Output signal of ND gate 17, 118...First signal enable signal, 119...Output of retrigger type monostable multivibrator 19, 120...
・First signal detection enable signal, 121...
AND gate output. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 4 (ct) / +117 l / Figure 7 d Sound 1. , I
Import≦ --11th 9 Figure 10 Figure dl-7/l+ Figure 11 (Gotobuwo month Figure 12 Figure 13 Figure t

Claims (7)

[Claims] (1) An information recording and reproducing apparatus that records and reproduces data in the sector in an optical disc having a plurality of sectors, each sector consisting of a sector identifier ID recording address information and a data field section DF recording data, means for detecting a sector having a defect in the sector identifier ID and/or the data field DF as a defective sector; and means for recording a first signal other than data in the data field DF of the sector; means for overwriting a sector identifier ID of a sector with a second signal that causes an error in reading address information;
The first data recorded in the data field DF of the sector
means for detecting the first signal, records the first signal in the data field part DF of the defective sector,
An information recording and reproducing device characterized in that a second signal is superimposed on D. (2) A means for substituting a defective sector with a sector at another position on the optical disk is provided, and by detecting the first signal, the target sector is notified as a defective sector during data recording to be alternatively recorded. 2. The information recording and reproducing apparatus according to claim 1, wherein said sector substitution means is activated upon knowing that the target sector has already been substituted. (3) Information recording and reproducing according to claim 1, wherein a first signal is first recorded in the data field part DF for a defective sector, and then a second signal is overwritten in the sector identifier ID. Device. (4) An information recording and reproducing apparatus according to claim 1, 2, or 3, characterized in that alternative sector information is recorded in the first signal. (5) The first signal includes a signal component having a lower frequency than the data modulation signal recorded in the data field section DF. 4. The information recording and reproducing device according to item 4. (6) The information recording and reproducing apparatus according to claim 1, wherein the sector is determined to be a bad sector upon detection of a read error in the sector identifier ID or a dropout in the data field portion DF. (7) Recording and reading data with an error correction code added to the data field DF, generating an error flag from the error syndrome of the demodulated data, and determining a sector in which the error flag exceeds a predetermined standard as a bad sector. An information recording and reproducing apparatus according to claim 1, characterized in that: