JPS60121575A - Optical information recording and reproducting device - Google Patents

Abstract

PURPOSE:To identify a defective writing sector by inspects the drop-out during writing of the data to the data field, and by writing a bad-mark signal in the bad-mark field by the detection of the error which exceeds some reference. CONSTITUTION:A digital modulation circuit 4 is activated by a writing gate signal 102, and data 25 are recorded in a data field 22 of a sector. The waveform of a reproduction signal 104 is disturbed by the drop-out of the data field 22, and it is detected by a writing error detection circuit 18. A bad-mark signal generation circuit 19 outputs a bad-mark signal 107 by an error detection signal 106, and the signal 107 is marked on a bad-mark field 23. Next, a reproduction gate signal 103 is outputted from a controlling part 16, and a digital demodulation circuit 15 demodulates a reproduction signal 105. The reproduction signal 105 is also inputted to a bad-mark signal detection circuit 20. When a bad-mark 24 is detected, a bad-mark detection signal 108 is transmitted to the controlling part 16, and it is decided to be a defective writing sector.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical information recording and reproducing device for recording and reproducing data on an optical recording disk, and particularly for detecting errors that occur in the optical recording disk while recording data on the optical recording disk. The present invention relates to an optical information recording and reproducing apparatus that can confirm the recording of an optical recording medium and verify the accuracy of the recording.

Conventional configurations and their problems Optical recording disk memory, which is seen as a promising high-density, large-capacity memory, requires error control technology such as error detection and error correction to overcome the low error rate of optical recording disks. It is.

In order to achieve high track density, optical recording disks are usually provided with optically detectable guide tracks such as guide grooves. Data is recorded by irradiating light and causing holes or changes in reflectance. The recorded data is read as changes in reflected light by irradiating the optical recording disk with sufficiently weak laser light.

Recording dots and track pinches are about 1 μm, so various defects may occur depending on the manufacturing process of the optical recording disk, the formation of guide tracks, the manufacture of replica disks, the deposition of recording materials, the formation of protective layers, and the environment in which the optical recording disk is used. , dust, and scratches occur, resulting in a dropout of the playback signal. These dropouts vary widely, with burst-like dropouts and random dropouts occurring to the same degree. As a result,
The raw error rate of an optical recording disk is 1σ4~10−
6, which is currently much worse than the raw error rate of 10''9 to 1σ12 of a magnetic disk, which is a typical conventional recording medium.

FIG. 1 is a conventional example of a configuration diagram of an optical information recording/reproducing apparatus. In Figure 1, 1 is a data buffer memory for temporarily storing data to be recorded, and 2 is an error detection/buffer memory.
An error control circuit for correction; 3 a sector buffer memory for storing encoded data to be recorded on the optical recording disk 9; and 4 a digital modulation circuit. 6 is a semiconductor laser drive circuit, 6 is an optical head, 7 is a head amplifier,
8 is a near motor that moves the optical head 6 and head amplifier 7 at high speed. 9 is an optical recording disk, and 1o is a disk motor that rotates the optical recording disk 9.

Reference numeral 11 denotes a focus/tracking servo circuit that focuses the output beam of the optical head on a predetermined track of the optical recording disk 9 and follows it. 12 is a linear motor drive circuit, and 13 is a waveform equalization circuit for correcting the frequency of the reproduced signal output from the hesodon amplifier 7 to improve waveform deterioration.

Reference numeral 14 denotes an address reproducing circuit that demodulates address information recorded on the tracks of the optical recording disk 9. 15 is a digital demodulation circuit, and 16 is a control section for the entire apparatus.Next, the operation shown in FIG. 1 will be explained.

A sector format disk in which the optical recording disk 9 has a trunk divided in advance into a plurality of sectors will be explained. Data corresponding to the sector capacity is input to the data buffer 1. This sector capacity ranges from 256B (bytes) to 10
It is 24B. The input data of the data buffer 10 is transferred to BCH (Bose-Chau) by the error control circuit 2.
dhur i -Hocquenghen) code, R
An error detection and correction code such as an S (Reed Solomon) code is stored in the puller buffer 3 as encoded data consisting of a generated check code.

The sector buffer 3 is temporary storage for recording in sectors of the optical recording disk 9, and is used to randomly distribute burst errors occurring in the optical recording disk 9 to each code word in the encoded data. It has the function of "leaving". The encoded data in the sector buffer 3 is input to a digital modulation circuit 4 in a mixed manner and modulated into a signal suitable for optical recording. The modulated signal output 100 of the digital modulation circuit 4 is modulated by the semiconductor laser of the optical head 6 by the semiconductor laser drive circuit 6, and the modulated signal output 100 is recorded in a predetermined sector.

Track access to the optical recording disk 9 is performed by reading the address output 101 of the address reproduction circuit 14, calculating the difference between the current address and the target address in the control section 1e, and controlling the linear motor 8 with the linear motor drive circuit 12. The designated sector is detected by the controller 16 comparing the sector address included in the address pre-recorded at the beginning of each sector of the optical recording disk 9, and the write gate signal 102 is sent to the head. The amplifier 7 amplifies a weak reproduction signal obtained by photoelectrically converting changes in reflected light from the optical recording disk 9 using a photoelectric conversion element built into the optical head 6. The reproduced signal 104 amplified by the head amplifier 7 is frequency-corrected by the waveform equalization circuit 13 and binarized to become a reproduced signal output 106. The reproduced signal output 105 is demodulated by the digital demodulation circuit 15, deconfused as reproduced encoded data, and temporarily stored in the sector buffer 3.

The reproduced encoded data is checked for errors in the error control circuit 2, and if an error is detected, it is corrected and stored in the data buffer 1.

In FIG. 1, to check whether data has been recorded correctly, the recorded sector is played back and the error control circuit 2 detects an error, or the data buffer 1 is used to check whether the input data and the playback data are Verification through data comparison is necessary.

Optical recording discs have a raw error rate of 10-4 to 1o-5.
Therefore, a powerful error detection and correction code is used, and a time delay of several 100,778 to several m8 is involved in decoding the reproduced encoded data. For this reason, when attempting to perform the above-mentioned recording verification on a sector format disk, there is a rotational wait for verification, making it impossible to perform continuous sector recording. Waiting for disk rotation causes a problem in that the data transfer speed to the data buffer 1 is significantly reduced.

Purpose of the Invention The present invention provides a signal for identifying that the written data is defective by detecting an error in the written data caused by a defect in the optical recording disk during recording on the optical recording disk. It is an object of the present invention to provide an optical information recording/reproducing device that enables a high-speed write verify operation by recording data after data and easily identifies a defective write sector when reading a sector.

Structure of the Invention The present invention provides an optical recording disk having a guide track divided into a plurality of sectors, in which the sector is divided into a data field and a bad mark field, and when data is recorded in the data field of this sector, there is a The occurrence of a write error is inspected, and if a write error is detected, a bad mark signal is recorded in the bad mark field, thereby indicating that the corresponding sector is a bad write sector in which an error exceeding a predetermined error correction level has occurred during writing. It makes clear that something is true.

When data in a sector to which a bad mark field has been written is newly written to another unrecorded sector, this bad mark signal is used to determine a defective writing sector or to control chaining of good sectors.

DESCRIPTION OF THE EMBODIMENT FIG. 2 is a block diagram of an embodiment of the optical information recording/reproducing apparatus of the present invention.

In FIG. 2, 1 to 16 and 100 to 105 correspond to the numbers in FIG. 1, and the same numbers are the same. 1
7 is an OR gate, 18 is a write error detection circuit, 19
2 is a bad mark signal generation circuit, and 20 is a bad mark detection circuit.

The data input to the data buffer 1 is given an error detection and correction code by the error control circuit 2, and is stored in the sector buffer 3 as encoded data.

Recording on the optical recording disk 9 is performed by reading the encoded data stored in the sector buffer 3 so as to intersect with each other, modulating it in the digital modulation circuit 4, and inputting it to the semiconductor laser drive circuit 5 as a modulation signal output 100. . The modulated signal output 100 is optically recorded on the optical recording disk 9 by the optical head 6 .

The light reflected by the optical recording disk 9 while recording the modulated signal output 100 is converted into an electric signal by the photoelectric conversion element of the optical head 6, amplified by the head amplifier 7, and inputted to the waveform equalization circuit 13 as a reproduction signal 104. be done.

This reproduction signal 104 is generated by direct defects of recording dots due to defects such as scratches and dents on the tracks of the optical recording disk 9;
Alternatively, changes in the amplitude of the reproduced signal 104 due to defocusing of the recording light beam due to the influence on focus/tracking servo, S/N deterioration due to tracking deviation, jitter of recording dots, etc. are reflected. The reproduced signal 104 is frequency-corrected and binarized by the waveform equalization circuit 13.

The reproduced signal output 104 is a signal containing defects in the optical recording disk 9.

The write error detection circuit 18 monitors the state of the waveform of the reproduced signal 104 and detects a dropout exceeding the error correction capability of the error control circuit 2. If the write error detection circuit 18 detects a dropout that exceeds the correction capability, the error detection signal 106 is output, and the bad mark signal generation circuit 19 stops recording in the bad mark field immediately after the corresponding data field. A bad mark signal 107 is generated. This bad mark signal 107 is applied to the semiconductor laser drive circuit 6 through the OR gate 1γ and written onto the optical disc 9.

FIG. 3 is a diagram illustrating the sector format and bad mark writing of the optical recording disk 9 used in the optical recording/reproducing apparatus of the above embodiment.

In FIG. 3, 21 is an address, 22 is a data field in which data is written, and 23 is a bad mark field in which a bad mark signal is written.

FIG. 3(a) shows the arrangement of the sector address 21, data field 22, and bad mark field 23, and FIG. 3(b) is a diagram showing a good write sector and a bad write sector. ) has a bad mark 24 written in it by the error detection signal 106 during writing.

FIG. 4 is a writing timing chart of the bad mark signal 107.

The digital modulation circuit 4 is activated by the write gate signal 102, and data 26 is recorded in the data field 22 of the sector. The waveform of the reproduced signal 104 is detected by a long dropout 11'O in the data field 22, and the write error detection circuit 18 detects this dropout 110 and outputs an error detection signal 106. In response to this error detection signal 106, the bad mark signal generation circuit 19 outputs a bad mark signal 107, which is marked in the dot mark field 23.

As described above, the reproduction gate signal 103 is outputted from the 0 control unit 16 to explain the reading of the defective write sector in which the bad mark signal 107 has been written, and the digital demodulation circuit 16 outputs the reproduction signal 105. This reproduction signal 10
6 is also input to the bad mark signal detection circuit 20, and it is checked whether the bad mark 24 is written in the bad mark field 23.

If a bad mark 24 is detected, a bad mark detection signal 108 is sent to the control unit 16, and the control unit 16 determines that the corresponding sector is a bad write sector in which an error was detected during writing.

As is clear from the above explanation, when a dropout exceeding the correction ability is detected while writing data to a sector,
By writing a bad mark immediately after recorded data, data can be continuously recorded in sectors at high speed without the rotation of the optical recording disk slowing down.

As the bad mark signal 107, a pulse (l, burst signal) may be used.

The data of the sector in which the bad mark signal 107 has been written is re-recorded by another unrecorded sector busy control section 16.

Further, in this embodiment, an example is shown in which the reproduction signal 104 is used as the detection input signal of the write error detection circuit 18, but it goes without saying that the servo error signal of the head amplifier 7 may also be used.

Further, in this embodiment, the output of the error detection signal 106 is determined as the error correction capability of the error control circuit 2, but it goes without saying that a more severe judgment may be used. The data field and the bad mark field are tracked, and the dropout is checked while writing data to the data field, and upon detection of an error exceeding a certain criterion, the bad write sector is detected by writing a bad mark signal to the bad mark field. In addition to making identification possible, data can be written at high speed without loss of rotational waiting time of the optical recording disk, and its practical effects are great.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the conventional configuration of an optical information recording and reproducing device, FIG. 2 is a block diagram showing the configuration of an embodiment of the optical information recording and reproducing device of the present invention, and FIG. 3 is a block diagram showing the configuration of an embodiment of the optical information recording and reproducing device of the present invention. FIG. 4 is a diagram showing the sector format and written signals of the optical recording disk of the optical information recording/reproducing apparatus, and FIG. 4 is a waveform diagram showing the writing timing of the bad mark signal. 1... Data buffer, 2... Error control circuit, 3... Sector buffer, 4...
...Digital modulation circuit, 6...Semiconductor drive circuit, 6...Optical head, 7...
Head amplifier, 9... Optical recording disk, 13.
... Waveform equalization circuit, 15 ... Digital demodulation circuit, 17 ... OR gate, 18 ...
...Writing error detection circuit, 19...Bad mark signal generation circuit, 20...Bad mark signal detection circuit, 100...Modulation signal output, 104
...Reproduction signal, 106...Error detection signal, 107...Bad mark signal, 108.
...Bad mark detection signal. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
1!1 Figure 4

Claims (1)

[Claims] An optical recording disk having a guide track divided into sectors consisting of a data field for writing data and a bad mark field provided after the data field, and a recording/reproducing disk for recording and reproducing data in any sector of the optical recording disk. and write error detection means for checking an error that occurs while writing data to a sector by the recording/reproducing means, and when the write error detection means detects an error, a bad mark field of the write sector is marked with a bad mark. An optical information recording/reproducing device that writes a mark signal to mark the write sector as a defective write sector, thereby making it possible to identify a defective write sector when reading data from the sector.