KR100217752B1 - Bad sectar processing method of optical disc surface - Google Patents

Abstract

end. TECHNICAL FIELD This invention relates to a bad sector processing method for an optical disk surface.

I. SUMMARY OF THE INVENTION In the apparatus for reproducing an optical disk having a UDF file format, the bad sector on the optical disk surface can be detected and processed to efficiently manage the bad sector on the optical disk surface. In addition to providing a method, an optical disk recording / reproducing apparatus having a UDF file format and providing a method for preventing recording data from being lost by bad sectors present on the optical disk surface during data recording. .

All. SUMMARY OF THE INVENTION A bad sector processing method of an apparatus for reproducing an optical disc having a UDF file format, comprising: setting a plurality of point points at an arbitrary point on the surface of the optical disc, and then reproducing data at each set point. When an error occurs, the bad sector block is detected by scanning a track including the corresponding point, and the detected bad sector block is excluded from the logical free space.

la. Important uses of the invention: Can be used for CD-ROM drives, CD-Rs, CD-R / W drives.

Description

Bad sector treatment method of optical disk surface

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc recording / reproducing apparatus, and more particularly to a method for processing a bad sector present on an optical disc surface having a UDF file format.

Optical discs such as CD-R (Compact Disc Recordable), DVD-R (Digital Video Disc Recordable), DVD-ROM, CD-R / W (Compact Disc ReWritable) and the like have a UDF (Universal Disc Format) file format. Data storage space management for an optical disk having a UDF file format is processed according to the specifications as shown in Table 1 below using volume information.

Logical Volume Integrity Descriptor {....... . unsigned long Free Space Table [??]. . }

As shown in Table 1, the conventional UDF file format does not provide a method for treating the bad sector area. Therefore, there is a problem in that the bad sector existing or existing on the optical disk surface cannot be managed efficiently.

Accordingly, an object of the present invention is to provide a method for efficiently managing a bad sector on an optical disk surface by detecting and processing a bad sector on the optical disk surface in an apparatus for reproducing an optical disk having a UDF file format. In providing.

Another object of the present invention is a bad sector processing method having a UDF file format and capable of preventing the loss of recording data by a bad sector existing on the optical disk surface during data recording in a recordable optical disc recording / reproducing apparatus. In providing.

The present invention for achieving the above object in the bad sector processing method of the apparatus for playing an optical disk having a UDF file format,

After setting a plurality of point points at any point on the surface of the optical disk, if a data reproduction error occurs at each set point, the track including the point is scanned to detect a bad sector block, and the detected bad sectors are detected. It is characterized by excluding blocks from logical free space.

1 is a block diagram of a CD-R / W drive as an optical disk player according to an embodiment of the present invention.

2 is a plan view of a CD-R / W disc 102 for visually showing a predetermined point point for bad sector detection according to an embodiment of the present invention.

3 is a bad sector detection and processing flow diagram according to an embodiment of the present invention.

Hereinafter, a bad sector detection and processing process according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 shows a block diagram of a CD-R / W drive as an optical disk reproducing apparatus according to an embodiment of the present invention. Referring to FIG. 1, the CD-R / W disc 102 rotates at a fixed speed by the rotation of the spindle motor 106. The optical pickup 104 optically picks up the data recorded on the CD-R / W disk 102 and converts the data into an RF signal, which is an electrical signal, and outputs the signal to the signal processing unit 110. The optical pickup 104 also enters a laser beam according to the encoded recording data under the control of the optical output control unit 108 and records it on the CD-R / W disc 102 surface. This optical pickup 104 is driven by a focus actuator for a focus servo and a tracking actuator for a tracking servo. The spindle motor 106 rotates at a constant speed CLV by a drive signal input from the servo driver 128, and the sled motor 130 is input from the servo driver 128. Drive by the sled servo drive signal to transfer the optical pickup 104 on the CD-R / W disc 102. The servo controller 126 outputs control signals for the rotation control of the CD-R / W disc 102 and the focusing and tracking control of the optical pickup 104 by the control of the microcomputer 122 and the servo driver 128. Outputs the driving signal according to the spindle motor 106 and the sled motor 130. Meanwhile, the signal processing unit 110 performs linear equalization processing and waveform shaping processing such as amplification, noise reduction, phase synchronization, etc. of the RF signal output from the optical pickup 104, and outputs the corresponding EFM signal to the EFM decoder 112. . Then, the signal processor 110 processes the signal input from the EFM encoder 124 at the time of data recording in the reverse process of data reproduction and outputs the signal. The EFM decoder 112 decodes the input EFM signal, performs error correction, and transmits it to the host computer through the interface 114. The interface 114 is connected to the DRAM 116 used for the data buffer and interfaces data transmitted and received between the host computer and the CD-R / W disk 102. The path controller 118 connected to the PROM 120 switches the path of data transmitted and received to and from the host computer under the control of the microcomputer 122. In addition, the microcomputer 122 controls the overall operation of the CD-R / W drive by embedding a memory in which the bad sector detection and processing control program according to the embodiment of the present invention is stored. That is, the microcomputer 122 processes the control data input from the EFM decoder 112 and the EFM encoder 124 and transfers the reproduced data to the host computer via the interface 114, while simultaneously transferring the transferred data to the CD-R / The servo drive unit 128 of the drive is controlled to be written on the W disk 102 surface. The EFM encoder 124 encodes the data received through the interface 114 and outputs the encoded data to the signal processor 110 and the light output controller 108.

FIG. 2 is a plan view of a disk for visually showing a predetermined point point for bad sector detection according to an embodiment of the present invention, and FIG. 3 is a flowchart illustrating a bad sector detection and processing flow chart according to an embodiment of the present invention. will be.

Hereinafter, a bad sector detection and processing process according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3.

First, when the microcomputer 122 receives a command to detect the bad sector existing on the CD-R / W disc 102 from the host computer, the microcomputer 122 responds to the optical pickup to the first point among the preset points in step 140. Move 104). It is assumed that the first point is a point A existing in the innermost circumference of FIG. 2. Thereafter, the microcomputer 122 plays back data in step 142 and checks in step 144 whether a playback error occurs during data playback. If an error does not occur during data reproduction, it is determined that the corresponding sector is normal, and the process proceeds to step 154 to check whether the current point A is the last point among preset points. The microcomputer 122 moves to the next preset point point (that is, point B point) in step 152 and proceeds to step 142. Then, the above steps 142 and 144 are repeated. If a playback error occurs at point K while data is normally played back at the preset point point as described above, the microcomputer 122 proceeds to step 146 to select the corresponding track (track including point K) as shown in FIG. 2. A data reproducing operation for continuously detecting bad sectors is performed while following. The reason is that due to the nature of the bad sector, the bad sector exists continuously around one bad sector. Therefore, the microcomputer 122 performs tracking servo control in step 146 and continuously checks whether the bad sector is detected, and then proceeds to step 148. If the bad sector is continuously detected above the set value in step 148, the microcomputer 122 proceeds to step 150, stores the corresponding bad sector block in the internal memory, and proceeds to step 152, otherwise directly proceeds to step 152. The microcomputer 122 which detects the bad sector continuously at the point K moves the optical pickup 104 to the point L at step 152 and performs steps 142 and 144 again. Then, if it is detected in step 154 that the point point at which the current optical pickup 104 is located exceeds a predetermined point point, the microcomputer 122 proceeds to step 156 to logically free the bad sector block stored in the internal memory. ) And the bad sector detection and processing according to the embodiment of the present invention is terminated.

Thereafter, the overall volume information of the bad sector block existing on the CD-R / W disk 102 surface is defined in the specifications as shown in Table 2 through the above-described process, so that the management of the bad sector area in the UDF file format is also defined. You can do it.

Logical Volume Integrity Descriptor {....... . unsigned long Free Space Table [??] unsigned long Bad Space Table [??] unsigned long Size Table [??]. . }

In the embodiment of the present invention, a CD-R / W disc and a drive thereof have been described as an example, but an optical disc (CD-ROM, DVD-ROM, DVD-RAM) having a UDF file format without any modification is applied to the drive. You can also apply. Therefore, the scope of the invention should not be defined by the described embodiments, but should be defined by the equivalents of the claims and the claims.

As described above, the present invention has the volume information of the bad sector even in the UDF file format, which has an advantage of preventing data loss due to the bad sector existing on the recordable optical disc surface.

Claims (3)

In the bad sector processing method of an apparatus for reproducing an optical disk having a UDF file format, After setting a plurality of point points at any point on the surface of the optical disk, if a data reproduction error occurs at each set point, the track including the point is scanned to detect a bad sector block, and the detected bad sectors are detected. A bad sector processing method characterized by excluding a block from a logical free space. The method of claim 1, wherein the bad sector processing method is performed when a bad sector detection command is received from a host computer connected to the apparatus. In the bad sector processing method of a CD-R / W drive having a memory in which information on a plurality of preset point sectors is stored, Determining whether there is a bad state of a corresponding sector by sequentially moving an optical pickup to the plurality of point sectors upon receiving a bad sector detection command from a host; If the predetermined sector is determined as a bad sector, detecting a bad sector block by continuously determining whether or not a bad state is present with respect to adjacent sectors; And removing the detected bad sector block from the logical free space of the surface of the CD-R / W disk.

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