JPS62159378A - Optical disk device - Google Patents

Abstract

PURPOSE:To improve write data in quality by performing the error inspection of data for N-number of times switching a constant signal of a reproducing wave, after the data is written at an optical disk medium. CONSTITUTION:The presence/absence of the error in the data is inspected with an error correction detection circuit 7. An error signal 210 is monitored, and when the error is generated, a defective sector flag is written with a defective sector flag write circuit 3. At such a time, when no errors are generated, the presence/absence of the error is inspected reading out the data again after making on a signal 204. When the error exists, the defective sector flag is recorded at the said sector, and the data from a buffer 1 is written at another sector. When no errors exist, the data is read out again after making on a signal 205, then the presence/absence of the error being inspected. When the error exists, the defective sector flag is written at the said sector, and the data is recorded at another sector. When no errors exist, the data is read out making on a signal 206, then the presence/absence of the error being inspected. And when the error exists, the defective sector is written in the same manner, and when no errors exist, a write process is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a source disk device, and particularly to error checking after writing data.

[Conventional technology]

Conventionally, checking after writing to an optical disk medium has been performed using a data conveyor, ECC, etc., but the data has not been checked by giving a margin to the reproduced analog waveform.

Therefore, when the bits formed on the medium during writing are incomplete, there is a drawback that even if the bits formed on the medium during writing are normally reproduced by checking after writing, the bits become dull due to changes over time and cannot be reproduced. Problems to be Solved] An object of the present invention is to provide an optical disc device that can detect the presence of unstable bits during writing and improve the quality of written data.

[Means for solving problems]

According to the present invention, a circuit for writing fixed length data, a circuit for detecting errors in reproduced data, a data buffer for storing reproduced data, and a circuit for recording a flag indicating that the data/card has an error are provided. An optical disc device having the following is obtained.

〔Example〕

Next, one embodiment of the present invention will be described with reference to the drawings.

the second indicating the format written on the optical disc medium;
Referring to the figure, IDII records the track address and sector address values of the sector, and is formatted on the disk surface in advance. BAI)F
LAG 12 is Tenor. DATA13 is the data section for writing, and E and CCl4 are error correction codes for the write data.

Referring to FIG. 1, a data buffer 1 stores data from a host device. 2 is an FCC generation circuit, and 3 is a bad sector flag writing circuit. The microprocessor 4 controls the data buffer, data transfer, bad sector flag writing, and switching of various analog waveform constants. 5 is a data buffer for accumulating playback data, 6 is a write data modulation circuit, 7 is a data error correction detection circuit, 8 is a selection circuit, 9 is a register that generates signals for changing various constants to the device, IO is data The demodulation circuits are shown respectively.

100 is data from the host device, 109 is data read to the host device, 101 is data read from the data buffer, 102 is data and the generated ECC output signal, 103 is modulated write data, 105t! This is a defective flag signal.

106 is data read from the device, 107 is read data after demodulation, 108 is data after Fi error correction, and 109 is data to be transferred to the host device. 2
01 is a buffer control signal from the microprocessor. 202 is ECC from the microprocessor
It is a control signal.

and 209 are outputs of each register and serve as control signals to the device. 210 is an error detection signal that can be sensed by the microprocessor.

A method of checking data after data is written in this circuit will be further explained with reference to FIG.

Data buffer 1. ECC generation circuit 2. Modulation circuit 6 and selection circuit 8 write data on the medium according to instructions from microprocessor v4. After that, the data written by the microprocessor 4 is read out, the data is demodulated by the demodulation circuit 10, and the error correction detection circuit 7 checks whether there is an error in the data 3. At this time, the read data is stored in the data buffer 5. has not yet been transferred to the higher-level device.

The error signal 210 is monitored, and if an error occurs, a bad sector flag is written into the sector by the bad sector flag writing circuit 3. Data in which bad sectors are recorded is not transferred to an upper level when reading. After convolving the bad sector flag, data from data buffer l is loaded into other sectors. Here, if there is no error, turn on signal 204 and read the data again to check for errors. .

If there is an error, a bad sector flag is recorded in that sector and data from data buffer l is written in another sector.

If there is no error, the signal 205 is turned on and the data is read again to check for errors. If there is an error, a bad sector flag is written in the sector and data is recorded in another sector. If there is no error, turn on signal 206
Read the data and check for errors. If there is an error, the bad sector is written in the same way, and if there is no error, the writing process is completed.

When a data error occurs during data reproduction, modes 204, 205 and 206tl are switched, and when there is no error, data is sent from the data buffer 5 to the host device.

In this way, waveforms with no margin can be judged as defective during the lock-in, and only normal data can be read out, making it possible to read out only stable data.

〔Effect of the invention〕

As explained above, the present invention can read only data with a stable waveform, and therefore has a great effect on media compatibility.

[Brief explanation of drawings]

Claims (1)

[Claims] means for writing fixed length data on an irreversible medium recorded by changing characteristics on the medium or removing a part of the medium by an optical method; a reproduction means for reading data recorded on the medium; a data buffer for storing written data transferred from a host device; a circuit for switching a threshold value of a reproduction waveform from the reproduction means; a circuit for switching a waveform tracking speed, a circuit for switching the gain of an amplifier connected to the reproduction means, a reproduction data error detection circuit, a data buffer for storing the reproduction data, and an error occurring in the reproduction data. 1. An optical disc device comprising means for recording a flag indicating that the data has been written to an optical disc medium, and after data is written on an optical disc medium, a constant signal of a reproduction waveform is switched to perform an error check on the data N times.