KR20030073235A - Discrimination method for defect area of optical disc reader/writer and defect management method using this - Google Patents

Abstract

PURPOSE: A method for discriminating a defect area of an optical recorder and a method for managing the defect are provided to distinguish a defect area of which defect is serious according to the degree of the defect, thereby preventing the waste of a substitution area for the effective use of an optical disc. CONSTITUTION: A method for discriminating a defect area of an optical recorder includes the steps of deciding an error-generating area as a presumed defect area when the error is generated during data reproducing(S312), checking the generation defects in the presumed defect area by reducing the reproducing speed(S309-S310), and deciding the presumed defect area as a defect area if the errors are continuously checked(S307).

Description

Discrimination method for defect area of optical disc reader / writer and defect management method using this}

The present invention is a defect area determination method and defect management of an optical recorder

nt) method, and especially as a previous step for performing defect management, continuously checks whether there is a defect while gradually reducing the reproduction speed of the optical recorder in a region where there is a possibility of defects, A defect area discrimination method of an optical recorder for performing defect management and a defect management method using the method.

Today, CD-RW (Compact Disk Rewritable) is one of rewritable optical disks, and is widely used as a storage medium for a large amount of temporary data or permanent data. However, if a defect occurs on the optical disc due to scratches due to deformation or neglect of management, some of the data stored on the optical disc may be lost. There is no countermeasure. However, with the recent release of the CD-MRW Defect Management & Physical Formatting, it is possible to prevent data loss due to CD-RW defects. The main focus is to secure a spare area and to record data to be recorded in the area in the replacement area when a defect occurs in the data area.

However, the defect management standard does not provide a criterion for determining whether a defect has occurred. This is because the result varies depending on the reproduction capability of each optical recorder even if the same defect discrimination criteria are presented.

1 is a diagram showing the configuration of a general optical recorder.

Referring to FIG. 1, a general optical recorder includes a rewritable optical disc 110, a pickup 120 for reproducing data recorded on the optical disc 110 as an RF signal, and a servo 130 for controlling the operation of the pickup. And an RF amplifier 140 for converting the RF signal from the pickup 120 into predetermined digital data, and a signal processor for demodulating the digital data output from the RF amplifier 140 into a predetermined signal. 150, the microcomputer 160 to perform overall control of the optical recording and playback.

In the optical recorder having such a configuration, conventionally, the signal processor 1

Based on the generation amount of the C2 Error Pointer (C2PO) output from 50), it is determined whether the currently reproduced disc area is a normal area or a defective area. That is, the signal processor 150 demodulates the EFM (Eight to Fourteen Demodulation) of the reproduced signal reproduced in the specific region of the optical disc 110 through the pickup 120, and parity included in the reproduced signal. ), C1 error correction and C2 error correction are performed, and then C2PO indicating whether or not the C2 error is corrected is output. Therefore, the amount of C2PO output from the signal processor is checked, and if the value is equal to or greater than the predetermined value, the disc area being played is regarded as the defective area, and if it is equal to or less than the predetermined value, the normal area is classified.

Of course, the C2PO mainly occurs when the recording quality of information is low (a defect area). However, it often occurs even when the recording quality of information is relatively good. For example, as shown in FIG. 2, a large amount of C2PO generated when the optical recorder is operated at high speed may hardly occur at low speed. FIG. 2 is a diagram showing the magnitude of a tracking error between reproduction speeds in a general optical recorder.

Therefore, when C2PO is generated as in the prior art and all of them are regarded as defective areas, a problem arises in that the replacement area for defects is wasted and the optical disc 110 cannot be efficiently used.

In addition, in the conventional method, even when defect management is not possible due to a defect of the disk itself such as a scratch on the optical disc 110, the disc area is identified as a defective area, and thus there is a problem of repeatedly performing unnecessary defect management in the optical recorder.

The present invention has been created to solve the above problems, and as a previous step for performing defect management using an optical recorder, whether or not there is a defect while lowering the reproduction speed of the optical recorder in a region where there is a possibility of defects. The purpose of the present invention is to provide a method for determining a defect area of an optical recording / reproducing apparatus which continuously checks and distinguishes a defect area to be subjected to defect management by covering the weight of the defect.

Another object of the present invention is to provide a defect management method of an optical recorder using the defect area determination method as described above.

1 is a diagram showing the configuration of a general optical recorder.

Fig. 2 is a diagram showing the magnitude of a tracking error between reproduction speeds in a general optical recording player.

3 is a view showing an embodiment of a defect management method of an optical recorder according to the present invention;

<Explanation of symbols for main parts of the drawings>

110: optical disk 120: pick-up

130: servo 140: RF amplifier

150: signal processing unit 160: Micom

170: host 180: RAM

190: buffer

According to an aspect of the present invention, there is provided a method for determining a defect area of an optical recording / reproducing apparatus, the method comprising: if an error occurs in the process of reproducing data stored in an optical disc, determining a defective disk area as a defect suspect area; ; Repetitively checking for defects while reducing the reproduction speed of the optical recording and reproducing apparatus for the defect suspected area; And setting the disc area as a defective area if an error occurs continuously. Characterized in that it comprises a.

Here, the step of determining the defect area is characterized in that the defect area is determined by not only the error generated during the data reproduction process and whether there is an error correction, but also the reproduction speed at the time of playing the optical disc, the size of the TE level and the number of repetitions. do.

According to another aspect of the present invention, there is provided a defect management method of an optical recording / reproducing apparatus, the method comprising: defining an error-prone disk area as a defect suspect area when an error occurs in the process of reproducing data stored in an optical disk; Repetitively checking for defects while reducing reproduction speed of the optical recorder for the defect suspected area; Determining the disk area as a defective area if an error occurs continuously; And performing defect management on the defect area. Characterized in that it comprises a.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a view showing an embodiment of a defect management method of the optical recorder according to the present invention.

Referring to FIGS. 1 and 3, first, a command for reproducing a specific region of the optical disc 110 from the host 170 is applied to the microcomputer 160 (S301). Here, the specific area may be a general data area or an alternative area where data corresponding to the request of the host 170 is stored.

When a play command is applied from the host 170 (S301), the microcomputer 160 controls the servo 130, and the servo 130 controls the pickup 120 to record data recorded in a specific area of the optical disc 110. The read signal is read to output the reproduction signal, and the servo error signal is output (S302).

Meanwhile, the RF amplifier 140 extracts a focusing error signal or a tracking error signal from the output of the pickup 120 and supplies the servo error to the servo 130 and digitizes the playback signal. Binarized) to be supplied to the signal processor 150.

In this case, the signal processing unit 150 performs EFM demodulation of the digitized reproduction signal, extracts parity included in the reproduction signal, performs C1 error correction and C2 error correction, and then corrects the C2 error. Outputs C2PO indicating. Therefore, by checking the generation amount of the C2PO, it is possible to know roughly whether the disc area currently being played is defective. That is, if the amount of C2PO in one frame demodulated by the signal processor 150 is large, the disc area currently being played may be suspected as a defective area.

Subsequently, the reproduction speed of the optical recording / reproducing device is lowered with respect to the defect suspected area, and the defects are repeatedly checked. This process is as follows.

If the amount of C2PO generated in step S304 is greater than the predetermined amount Q, the magnitude of the TE level output from the RF amplifier 140 is checked (S308). At this time, if the TE level is greater than the predetermined level (L), the current playback speed is lowered step by step to replay the disc area (S310). However, since the reproduction cannot be repeated indefinitely, when the reproduction speed of the optical recorder becomes less than the predetermined speed S _m or the number of reproduction repetitions exceeds the predetermined number R _m (S309), the disc area is defective. It is determined that it is an unmanageable area, information about this is recorded in the MTA (Main Table Area) or STA (Second Table Area) of the optical disc (S311), and playback of the disc area is terminated. The MTA or STA is an area in which an information table for defect management is stored in an optical disc.

On the other hand, if the amount of generation of C2PO is smaller than the predetermined amount Q in step S304 or the T.E level is smaller than the predetermined level L in step S308, it is determined whether C3 error correction is possible (S305).

If the C3 error correction is impossible in the step S305, since the disc area is an area requiring defect management, the disc area is recorded in the defect management table of the RAM 180 (S312), and the current playback speed of the optical recorder is recorded. Steps S302 to S305 are repeated by replaying the disc area in steps. In this case, similarly, when the reproduction speed of the optical recorder becomes less than the predetermined speed S _m or the number of reproduction retries exceeds the predetermined number R _m (S309), the disc area is not capable of defect management. In operation S311, information on this is recorded in the MTA or the STA of the optical disc, and then the reproduction of the disc area is terminated.

On the other hand, if C3 error correction is possible in step S306, it is determined whether the current reproduction speed and the number of reproduction repetitions satisfy the defect management condition (S306). This is because there is little need to perform defect management on a disc area that can be read at a high speed or at several repetitions of reproduction, that is, a disc area having a relatively good recording quality. Here, the defect management condition means that the reproduction speed when the C3 error correction has occurred is smaller than the predetermined number S _m , and the number of reproduction repetitions when the C3 error correction has occurred is larger than the predetermined number R _m .

Thereafter, when the defect management condition is satisfied in step S306, the disk area is determined as the defect management area, and defect management is performed for this (S307). That is, data recorded in the defective area is recorded and replaced in the free area without defect, information about this is recorded in the MTA or the STA, and then the reproduction of the disc area is terminated.

As described above, the above embodiments are disclosed for the purpose of illustration, and those skilled in the art will appreciate that various modifications, improvements, substitutions, and additions may be made without departing from the spirit of the present invention. Accordingly, the technical scope of the present invention should be defined by the appended claims.

As described above, according to the defect area determination method and the defect management method of the optical recorder according to the present invention, since only the defect area in need of the defect management is distinguished according to the weight of the defect, it is replaced when the defect area is managed. Since the area is not wasted, there is an advantage that the optical disc can be used efficiently.

In addition, according to the defect area determining method and the defect management method of the optical recorder according to the present invention, when defect management is not possible due to its own defects such as scratches on the disc, the disc area is determined to be a defect management area and the information is determined. Since the recording to the MTA or STA, there is an advantage that the defect management is not performed for the disk area.

Claims (3)

If an error occurs in the process of reproducing the data stored in the optical disc, setting the error-prone disk area as a defect suspect area; Repeatedly checking the defect suspect area at a lower reproduction speed of the optical recorder; And If the error occurs continuously, determining the disk area as a defective area; Defect area identification method of the optical recorder, characterized in that it comprises a. The method of claim 1, wherein the determining of the defect area comprises: A method for determining a defective area of an optical recorder, characterized in that the defect area is determined by not only the error occurring during the data reproducing process and whether or not there is an error correction, but also the reproduction speed at the time of playing the optical disc, the size of the T.E level, and the number of repetitions. If an error occurs in the process of reproducing the data stored in the optical disc, determining the error-prone disk area as a defect suspect area; Repetitively checking for defects while reducing reproduction speed of the optical recorder for the defect suspected area; Determining the disk area as a defective area if an error occurs continuously; And Performing defect management on the defect area; The defect management method of the optical recorder, characterized in that it comprises a.