JPH01112573A - Optical disk controller - Google Patents

Abstract

PURPOSE:To prevent deterioration in the recording state of information by detecting number of errors of recorded information reproduced by an error correction circuit, correcting the recorded information by response to the number of errors and recording the result again on other area on the optical disk. CONSTITUTION:An error correction code word to detect a recording error is recorded at information recording, it is red by an error correction circuit just after recording, the number of errors is counted by each sector and when the number of errors is a specified number or below, it is regarded that the information is recorded correctly. When a defective sector where number of errors is a specified number or over exists, the correct information to be recorded on the defective sector is recorded again on the alternate sector of the track and it is read again to count the number of errors. When the number of errors over a specified number exists in the information recorded again or defective sectors are more than sectors provided to the track, the correct information is recorded again on the alternate track to count the number of errors. When errors still exist even after the repetition of the processings above for a prescribed number of times, it is discriminated that the disk is defective and the recording is stopped.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides an optical disc control system that detects recording errors when reproducing information recorded on an optical disc, corrects the detected recording errors, and records the corrected recording errors in a predetermined area of the optical disc. Regarding equipment.

[Conventional technology]

For example, the optical disc control device is disclosed in Japanese Patent Application Laid-Open No. 60-22602.
As disclosed in No. 6, in order to guarantee the recorded content of information recorded on an optical disc, a predetermined code is added to the information to be recorded to form an error correction code word, and the information is recorded on the optical disc in the form of an error correction code word. Immediately after recording, this error correction code word is played back to count the number of recording errors that have occurred, and this number of errors is a value that is sufficiently lower than the correction capability limit of the error correction circuit that corrects it. If the number of errors is less than the specified number, the information is recorded as no recording error has occurred, and if the number of errors is greater than or equal to the specified number, the correct information to be recorded is recorded for re-recording. re-record on another area of the optical disc provided in the

FIG. 1 is a schematic diagram showing the structure of an optical disc. A guide groove for guiding the recording and reproduction of information is provided in a spiral shape on the surface of the optical disc. One revolution of this guide groove corresponds to one track. is equally divided into a predetermined number of recording areas, so-called sectors, and among these sectors, a predetermined number of sectors are used as replacement sectors for re-recording. Furthermore, for example, a predetermined number of replacement tracks are provided on the outer periphery of the disk surface to re-record all of the correct information on that track when the number of bad sectors where recording errors have occurred exceeds the number of replacement sectors provided for each track. .

FIG. 3 is a flowchart showing an outline of a procedure for recording information on the optical disc configured as described above and correcting the recorded information. When information is recorded in units of one track, each time one track of information is recorded, it is played back to detect recording errors, and there are no bad sectors in which more than a specified number of recording errors have occurred on that track. If so, it is assumed that the information has been recorded correctly and the next information recording process is performed. If there is a bad sector, check whether the replacement sector of the track is free, and if the replacement sector is free, rewrite the correct information that should be recorded in the bad sector to the replacement sector of the track. , Furthermore, recording errors in the re-recorded information are detected, and if the errors are less than a specified number, the next process is performed. In addition, if there are more errors than the specified number of errors in the re-recorded information to the replacement sector, or if there are more bad sectors than the number of replacement sectors, all the information that should be recorded on the track is re-recorded on the replacement track, and then re-recorded. If a recording error is detected and the number of errors is less than the specified number, the recording process to the replacement track is terminated, and if the replacement track has a bad sector with the number of errors greater than the specified number, the bad sector is The correct information to be recorded on the replacement track is re-recorded in the next sector of the replacement track. If normal recording is not possible even after performing the above re-recording process a predetermined number of times, the optical disc is determined to be a defective medium and the process is stopped.

[Problem that the invention seeks to solve]

By the way, write-once type optical discs are used as files to store large amounts of information for a long time, but in this case, as the optical disc ages, the recorded information changes and the recording condition deteriorates, making it difficult to reproduce the correct information. There was a problem that it would no longer be possible.

The present invention has been made to solve these problems, and an object of the present invention is to provide an optical disc control device that can prevent the deterioration of the information recording state due to aging of the optical disc.

[Means for solving problems]

The present invention provides an error correction circuit that detects the number of recording errors in the reproduced information each time information recorded on an optical disk is reproduced, and corrects the recorded information according to the detected number of recording errors; The present invention is characterized by comprising a re-recording means for re-recording the information corrected by the circuit in another area of the optical disc.

[Effect]

In the present invention, when reproducing information recorded on an optical disc, an error correction circuit detects the number of recording errors in the reproduced information,
The recorded information is corrected according to the number of detected recording errors, and the re-recording means re-records the corrected information in another area of the optical disc.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof. FIG. 1 is a schematic diagram showing the configuration of an optical disc used in an optical disc control device according to the present invention, in which a guide groove for guiding information recording and reproduction is provided in a spiral shape on the surface of the optical disc. One lap is one track,
Information is recorded or reproduced from the inner circumference to the outer circumference. Also,
Each track is equally divided into a predetermined number of recording areas, so-called sectors, and the sectors of each track are assigned sector numbers 0 to Max in the order of recording and reproduction, and the last sector following sector Max is assigned sector numbers 0 to Max. If there is a recording error in the recorded information, this sector is used as a replacement sector to re-record the correct information.

Furthermore, a predetermined number of tracks on the outer periphery of the disk are used as replacement tracks for re-recording the correct information of the entire track when the required re-recording area is equal to or greater than the number of replacement sectors for each track.

FIG. 2 is a flowchart showing a procedure for detecting a recording error and re-recording correct information, which is performed when reproducing information by the optical disc control device according to the present invention. When information is recorded, it is recorded on an optical disc in the form of error correction codewords that are given a predetermined code for detecting recording errors, and an error correction circuit reads these error correction codewords immediately after recording and detects recording errors. The number of errors indicating this is counted for each sector, and if the number of errors is less than a specified number that is sufficiently lower than the correction ability of the error correction circuit, it is assumed that the information has been recorded correctly. If there is a bad sector with more than a specified number of errors, the correct information that should be recorded in the bad sector is re-recorded in a replacement sector of that track, and the error correction circuit reads out the re-recorded information to determine the number of errors. count. Also, if the re-recorded information has more than the specified number of errors, or if there are more bad sectors than the number of replacement sectors provided on that track, all the correct information that should be recorded on that track will be re-recorded on the replacement track. , the error correction circuit reads out the re-recorded information and counts the number of errors. If the number of errors is less than or equal to a specified number, it is assumed that the information has been recorded correctly, and if there are more than a specified number of bad sectors, the correct information to be recorded in the defective sectors is re-recorded in the next sector of the replacement track. If an error still exists even after performing the above re-recording a predetermined number of times, the disk is determined to be a defective medium and the information recording process is stopped.

Further, when reproducing recorded information, when information for one track is reproduced, an error correction circuit corrects errors in the reproduced information, and then counts the number of errors in each sector of the track. If the counted number of errors is less than or equal to the specified number determined based on the correction ability of the error correction circuit, the information on the track has not been re-recorded to the replacement sector or track, and the recording condition has not deteriorated. Therefore, the process moves on to the next process, such as information transfer of the reproduced track.

If the counted number of errors is greater than or equal to the specified number, first check whether the information in that sector has been re-recorded on a replacement sector or track, and if it has been re-recorded on a replacement sector or track, The re-recorded information is reproduced from the alternate sector or alternate track, and the error correction circuit checks the number of errors. If the number of errors is less than a specified number, the error is corrected, etc., to make the reproduced information correct.

Additionally, if the initially counted number of errors is greater than the specified number and re-recording is not performed on the replacement sector or replacement track, or if the information re-recorded on the replacement sector or replacement track contains more than the specified number of errors. If so, it is checked whether the error correction circuit can correct these errors, and if the error correction is possible, the error correction circuit corrects the error and re-records the corrected information on the replacement sector or replacement track. Furthermore, in the same way as when recording the information, the number of errors in the re-recorded information is checked, and re-recording is repeated until the number of errors falls below a specified number.

Further, if error correction by the error correction circuit is impossible, other error recovery processing is performed.

〔Effect of the invention〕

The optical disc control device of the present invention detects and detects recording errors when reproducing recorded information as well as when recording information.
The present invention has an excellent effect of correcting erroneous recorded information each time the information is reproduced, thereby preventing the deterioration of the information recording state due to aging of the disc.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the configuration of an optical disc, FIG. 2 is a flowchart showing the procedure for reproducing information by the optical disc control device according to the present invention, and FIG. 3 is a flowchart showing the conventional procedure for recording information.

Claims (1)

[Claims] 1. An optical disc control device that detects a recording error in information recorded on an optical disc, corrects the recording error in the detected information, and records the recorded information in a predetermined area of the optical disc. an error correction circuit that detects the number of recording errors in the reproduced information each time the optical disc is reproduced, and corrects the recorded information according to the detected number of recording errors; and an error correction circuit that corrects the recorded information according to the detected number of recording errors; 1. An optical disc control device comprising: re-recording means for re-recording in an area.