JPS63298876A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce the loss time of sector substitution by overwriting a prescribed signal to an address of an unrecorded sector adjacent radially if a correction disable data error is detected and disabling the reproduction of the succeeding address. CONSTITUTION:If a data error of disabled correction exists, a recording reproduction section 9 sends a correction disable detection signal 17 to a control section 6. When an error correction disable detection signal 17 is sent from the recording reproducing section 9 to the control section 6, the control section 6 uses a sector address of an unrecorded sector adjacent to the said sector as an object sector address 12 and sends the result to an address comparison section 7 and gives an overwrite command 18 to a signal generator 8 and a recording reproducing section 9. The signal generator 8 sends a prescribed recording signal 19 to the recording ad reproducing section 9, which overwrites the address 1 of the said sector to disable the address reproduction thereby inhibiting the data recording onto the said sector. Thus, a known overwrite signal is used to disable data recording further, thereby eliminating the loss time of substitution of a defective sector.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical information recording/reproducing apparatus using an optical information recording medium having a sector structure divided into a plurality of sectors.

Conventional technology An information recording area is formed by depositing an optical recording material on a substrate with spiral or concentric guide grooves,
In an optical disk recording and reproducing device that records and reproduces information sector by sector on an optical disk that has a sector structure in which the information recording area is divided into a plurality of sectors, it is necessary to be able to record information in a regular sector and reproduce it from a regular safeter. No. Furthermore, recorded information must be able to be reproduced.

Therefore, in conventional optical disk recording and reproducing devices, there are methods such as providing an address section at the beginning of a sector, counting sector separation signals between sectors to obtain the sector address, or using Japanese Patent Laid-Open No. 60-121534. As shown in the publication, address detection is performed at a shift from the optimal level during recording, and address detection is performed at the optimal level during reproduction, thereby ensuring that recorded information can be reproduced without fail.

However, even if the above measures are taken to prevent information from being recorded in bad sectors in the address area, if there is a dropout in the data recording area of the sector, the recorded information may contain errors that exceed the error correction ability. may become uncorrectable due to

When an error-uncorrectable sector occurs, the data in that sector is generally replaced with an alternative sector.

Problems to be Solved by the Invention In general, it is thought that dropouts often occur in a circular pattern as shown in Figure 3, so large burst errors occur when information is recorded and played back in a certain sector. Therefore, there is a high probability that large burst errors will occur in unrecorded sectors adjacent in the radial direction when information is recorded, making it impossible to correct the errors.

If data is recorded and then sector replacement is performed upon detecting that the data cannot be reproduced, the data recording time and the time required to detect the inability to correct errors become lost time. For this reason, if it is possible to prevent data from being recorded in a sector with a high probability of error correction being impossible and to immediately replace data with an alternative sector, the sector replacement time can be reduced.

In view of this, it is an object of the present invention to provide an optical information recording device that minimizes the occurrence of cases in which data cannot be corrected after data is recorded, thereby reducing loss time due to sector substitution.

Means to solve the problem If data is recorded in a certain sector and reproduced, and a large burst error occurs and the data becomes uncorrectable, the address of an unrecorded adjacent sector in the radial direction within a range corresponding to the burst length is detected. A predetermined signal is overwritten on the area so that the address cannot be read (and subsequent data recording is prohibited).

According to the above-described structure, the present invention overwrites a predetermined signal in the address part of the sector radially adjacent to the sector in which a burst error has occurred, thereby making the address part unreproducible, recording the data, and then writing the data. This is an optical information recording and reproducing apparatus that greatly reduces the probability of detecting uncorrectable conditions and shortens the loss time for replacing defective sectors.

Embodiment FIG. 1 is a diagram showing a recording format of an optical disc in an embodiment of the present invention.

In FIG. 1, 1 is an address section, 2 is an address mark, 3 is an address data section, 4 is a CRC section, and 5 is a data recording section. Each sector is composed of an address section 1 and a data recording section 5, and the address section 1 consists of an address mark 2 indicating the start of the address section, an address data section 3, and a CRC section 4 that is a check for the address section. Assuming that the address is n, the sector address n is previously recorded in the address portion of the n-th sector by initial formatting or the like before recording/reproducing.

FIG. 2 is a block diagram of an optical information recording/reproducing apparatus according to an embodiment of the present invention. In FIG. 2, 6 is a control section, 7 is an address comparison section, 8 is a signal generator, 9 is a recording/reproducing section, 10 is an optical pickup, and 11 is an optical disk. The control unit 6 is composed of a CPU and the like.

Now, when recording data in a certain sector, the control section 6 sends the target sector address 12 to the address comparison section 7,
A recording command 13 is sent to the recording/reproducing section 9. The recording/reproducing section 9 controls the optical pickup 10 and reads the address section l of the sector.
is read, and the reproduced sector address 14 is sent to the address comparison section 7. When the target sector address 12 and the reproduced sector address 14 match, the address comparison section 7 sends a coincidence detection signal 15 to the control section 6 and the recording/reproducing section 9, and the recording/reproducing section 9 also sends the coincidence detection signal 15 to the recording command 13 data is recorded in the corresponding sector.

Next, the control unit 6 sends the sector address of the recorded sector as the target sector address 12 to the address comparison unit 7, and sends a playback command 16 to the recording/playback unit 9 to read the data of the sector and correct the uncorrectable data error. Check to see if it exists. When there is an uncorrectable data error, the recording/reproducing section 9 sends an uncorrectable error detection signal 17 to the control section 6.

An error correction failure detection signal 17 is sent from the recording/reproducing section 9 to the control section 6.
is sent, the control unit 6 sets the sector address of the unrecorded sector adjacent to the sector to the target sector address 12.
and sends an overwrite command 18 to the signal generator 8 and recording/reproducing section 9. The signal generator 8 sends a predetermined recording signal 19 to the recording/reproducing section 9, and the recording/reproducing section 9 overwrites the address section 1 of the corresponding sector to make the address unreproducible, and henceforth prohibits data recording to this sector. . A signal for overwriting so that address part 1 of a sector becomes unreproducible has already been proposed in Japanese Patent Application Laid-open No. 61.
Publication No. 122931 lists the following 3fil type signals.

(1) Overwrite the entire address section.

(2) Overwrite the address mark.

(3) CR so that a CRC error occurs in the address part
Overwrite the length of part C or less.

Using such a known overwrite signal, the address part of the unrecorded sector radially adjacent to the bad sector with an uncorrectable data error is rendered unplayable, preventing data from being recorded in the future, thereby reducing the time lost in replacing the bad sector. (can do)

In addition, in the present invention, it is not necessary to limit the range to be overwritten in the address field to just the area immediately adjacent to the bad sector (if the scale of data error in the bad sector is large, a wider range in the radial direction with respect to the bad sector may be necessary). It is also useful to overwrite the address part of an unrecorded sector in the vicinity of .For example,
Assuming that the maximum error burst length allowed by error correction is Eo bits, and the error burst length is Ec, when Eoc≦2Eo, overwrite radially adjacent sectors, one sector on the inner periphery and one sector on the outer periphery. .

When 2Eo<Ec≦3Eo, radially adjacent sectors are overwritten, two sectors on the inner circumferential side and two sectors on the outer circumferential side.

When 3Eo<Ec≦4Eo, radially adjacent sectors are overwritten in 3 sectors on the inner circumferential side and 3 sectors on the outer circumferential side.

All you have to do is set the overwriting range like this.

As described in detail, the present invention records and reproduces data in a sector, and if an uncorrectable data error occurs, it overwrites the address part of an unrecorded sector adjacent to the sector, making it impossible to reproduce the address. This is an optical information recording/reproducing device that prohibits further data recording. Since dropouts often occur in a circular pattern, there is a high probability that sectors radially adjacent to a bad sector are bad sectors. According to the present invention, the address of an unrecorded sector adjacent to a bad data sector cannot be reproduced, and data cannot be recorded thereafter, so that processing can immediately be started to replace the bad sector. Therefore, when replacing a sector with a high probability of becoming uncorrectable, the time required for data reproduction to detect uncorrectable errors can be saved, and the throughput of sector replacement can be improved.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the recording format of an optical disc in an embodiment of the present invention, Fig. 2 is a block diagram of an optical information recording/reproducing device of the same embodiment, and Fig. 3 is a schematic diagram showing an example of occurrence of dropout in an optical disc. It is a diagram. l...address section, 2...address mark, 3...
- Address data section, 4... CRC section, 5... Data recording section, 6... Control section, 7... Address comparison section,
8... Signal generator, 9... Recording and reproducing section, 10...
Optical pickup, 11... Optical disc, 12...
・Target sector address, 13... Record command, 14...
・Reproduction sector address, 15... Match detection signal, 16
...Reproduction command, 17...Error correction uncorrectable detection signal, 1
8... Overwrite command, 19... Recording signal. Name of agent: Patent attorney Toshio Nakao (1 person) Figure 1

Claims (2)

[Claims] (1) The 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. In an optical information recording and reproducing device that records and reproduces data, when an uncorrectable data error is detected by reproducing data after recording data in a sector, the unrecorded data adjacent to the sector in the radial direction 1. An optical information recording and reproducing apparatus characterized in that a predetermined signal is overwritten in an address part of a sector, so that the address part of the adjacent unrecorded sector cannot be reproduced thereafter. (2) The 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. In an optical information recording and reproducing device that records and reproduces data, after recording data in a given sector, the sector is played back and a preset number of radial changes are made to the sector according to the size of data burst errors. 1. An optical information recording/reproducing apparatus characterized in that a predetermined signal is overwritten on an address part of a neighboring unrecorded sector, so that the address part of the neighboring unrecorded sector cannot be reproduced thereafter.