KR20070002958A - Method for recovering defect area in a optical disc player - Google Patents

Abstract

A defect area restoration method of an optical disk player is provided to be capable of confirming a restorable area of defect areas of an optical medium whenever an optical disk is played, without immediately skipping over the defect areas, so that the confirmed area is restored, therefore recordable capacity is extended. When a random optical disk is inserted into an optical disk player and played, a defect area of a data block of the disk is checked(S200,S202). If the defect area is checked from the data block, optical disk reflectivity is checked(S204,S206). It is decided whether the checked reflectivity is preset reflectivity(S208). If so, a defect entry number of the data block is searched, and defect entry information is deleted(S214,S216). An ISA(Inter Space Area) is deleted(S218).

Description

METHOOD FOR RECOVERING DEFECT AREA IN A OPTICAL DISC PLAYER}

1 is a schematic structural block diagram of an optical disc player for implementing the method according to the present invention;

2 is a flowchart of a defective area restoration process of the optical disc player according to the preferred embodiment of the present invention;

3 is an exemplary data area recorded in a typical optical disc player.

<Explanation of symbols for main parts of the drawings>

100: reflectance detector

102: control unit

104: error correction processing unit

106: block detection unit

108: defect area management unit

TECHNICAL FIELD The present invention relates to a control technique of an optical disc player, and more particularly, to a method for restoring a defective area of an optical disc player suitable for reconfirming and restoring a portion determined as a defective area of an optical media.

Optical discs are a disc medium that has begun to become more common as CDs become more popular.

In general, optical discs are discs for playback only such as CD-ROM, DVD-ROM, etc., discs capable of recording only once, such as CD-WORM (Write Once Read Many), and CD-RW ( ReWritable), DVD-RAM and the like are classified into a disc capable of repeatable recording.

The optical recording device drives a laser diode to irradiate a beam of relatively large energy that can change the physical characteristics of the information recording layer existing on the optical disk to record information on the optical disk and to record information on the optical disk. A small energy light beam that does not change physical properties is used to reproduce information from the optical disc.

On the other hand, a general optical disc player includes a function for managing a defect area of an optical disc. The defect area management method records information and data on a portion of the optical disc that is determined as an unrecordable area of the optical disc in a TDMA (Temporary Defect Management Area), and then prevents recording of data in the corresponding area to prevent recording errors. Say to block on.

3 is an exemplary diagram of a data block for explaining a defect area management method in a general optical disc player.

As shown in FIG. 3, data blocks that appear during playback and recording of an optical disc player may be divided into TDMA, Inter Space Area (ISA), recording areas (REC1, REC2), and defective areas (Defect1, Defect2), respectively. have.

When the recorded data is first checked for reflectance, the reflectance is below the limit, or the data block is read and the error correction process is performed to determine that the error cannot be corrected, the data area is changed to the defective areas Defect1 and Defect2. Will be declared.

In the areas declared as defective areas Defect1 and Defect2, information defined to enable mapping between the separate areas, the ISA and the two areas as much as the corresponding areas are recorded and managed in the TDMA.

Subsequently, when recording is performed, data is recorded in the ISA without recording the defect areas Defect1 and Defect2. During subsequent reproduction, the area is skipped and moved to the ISA for reproduction.

However, such a conventional defect area management method has a disadvantage in that the recordable capacity of the optical media is relatively reduced as the non-recordable area increases.

That is, the area once identified as the defective area can secure the reliability of data recorded on the media by preventing rewriting later, but has a disadvantage of gradually decreasing the capacity of the media.

The present invention has been implemented to overcome the above-mentioned limitations of the prior art and to solve all the problems. When a defective area is detected during playback of an optical disk, the present invention is not skipped immediately, and a recoverable area of the defective area of the optical media is checked every time. It is an object of the present invention to provide a method for restoring a defective area of an optical disc player which can increase the recordable capacity by restoring the memory.

According to a preferred embodiment of the present invention for achieving this object, a method for restoring a defective area of an optical disk player for detecting a data block including a TDMA, an ISA, a recording area, and a defective area of an optical disc, comprising: Checking a defective area of a data block of the optical disc when an arbitrary optical disc is inserted and driven to drive; checking the optical disk reflectance when a defective area is detected in the data block as a result of the defective area checking; Determining whether the reflectance of the checked optical disk is a predetermined reflectance; if the checked reflectance is a predetermined reflectance, searching for a defect entry number of the data block and deleting the defect entry information; and deleting the ISA. A method of restoring a defective area of an optical disc player is provided.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

Prior to the description, the optical disc player to be applied to the present invention will be limited to a DVD player, which is for convenience of description and other means for reproducing the optical disc, for example, DVD / VCR combo, DVD It will be apparent to those skilled in the art that a -RW player or the like can be easily applied.

1 is a schematic block diagram of an optical disc player for performing the method according to the present invention, which includes a reflectance detector 100, a controller 102, an error correction processor 104, a block detector 106, and a defect area manager. 108.

The reflectance detection unit 100 is provided in pickup drive means (not shown) of the optical disk player, and the like, and detects the reflectance of the optical disk inserted into the optical disk player.

The block detector 106 reads the data block of the inserted optical disc, and the error correction processor 104 performs an error correction process on the data block detected by the above-described block detector 106 to correct the error. Judge whether or not.

The control unit 102 is a means for controlling the overall operation of the optical disc player. In particular, the control unit 102 manages a defective area of the data block according to the reflectance detected by the reflectance detection unit 100 according to the present embodiment.

Such defect area management is first performed to read data recorded when the optical disc is reproduced. If the detected reflectance does not reach the preset reflectance, the control unit 102 declares the data area as a defective area. In addition, the control unit 102 declares the data area as a defective area according to a result of the error correction impossibility provided from the error correction processing unit 104.

The defective area manager 108 stores the defective area information of the corresponding data block under the control of the controller 102 or provides the stored defective area information according to the request of the controller 102.

Hereinafter, the above-described configuration will be described in detail with reference to the flowchart of FIG. 2 attached to a process of restoring a defective area of an optical disk player according to an exemplary embodiment of the present invention.

First, as in step S200, when any optical disk is inserted and reproduced in the optical disk player, the control unit 102 proceeds to step S202 to check the defective area of the data block of the optical disk.

As a result of the defective area check, if a defective area is detected in the data block (S204), the control unit 102 proceeds to step S206 to check the optical disk reflectance through the reflectance detection unit 100.

After performing step S206, the controller 102 proceeds to step S208 to determine whether the checked reflectance of the checked optical disk is a predetermined reflectance.

As a result of the determination in step S208, if the checked reflectance is not the preset reflectance, the controller 102 proceeds to step S210 and step S212, skips the defective area and moves to the corresponding ISA. That is, the steps S210 and S212 determine that there is no change in the initially declared defective area, and thus skips the defective area as in the prior art to prevent rewriting.

However, as a result of the determination in step S208, when the checked reflectance is the preset reflectance, the control unit 102 proceeds to steps S214 and S216.

In step S214, the control unit 102 searches for a defect entry number and proceeds to step S216 to delete the entry. That is, as shown in Fig. 3, the defect entry information recorded in the TDMA is deleted.

In this way, if it is determined that the initial reflectance is not the first reflectance, but then reaches the preset reflectivity again through the re-detection process, it is incorrectly judged whether the first disk is defective, or if it is correctly determined again, or the cause of the first disk defect is If it is due to dust or fine scratches, then these causes are eliminated.

That is, the present invention considers the possibility that even if a defect occurs in the data block of the original disk, the reflectance can be checked again and restored later.

Finally, in step S218, the control unit 102 can restore the data block determined to be a defective area by deleting the corresponding ISA again to the recording area.

In other words, the present invention prevents recording after setting the defective area of the optical media to secure the reliability of data, and when the corresponding area becomes a recordable area, it is detected during reproduction and restored to the recordable area.

According to the present invention, there is an effect of reducing the media recording capacity and enabling efficient use by eliminating the situation where the recordable area remains permanently unrecordable due to the temporary unrecordable state.

As mentioned above, although this invention was demonstrated concretely based on the Example, this invention is not limited to such an Example, Of course, various deformation | transformation are possible for it within the technical idea and the scope of a claim mentioned later.

Claims (3)

A method for restoring a defective area of an optical disc player that detects a data block including a TDMA, ISA, recording area, and defective area of an optical disc, Checking a defective area of a data block of the optical disc when an arbitrary optical disc is inserted into the optical disc player and driven for reproduction; Checking the optical disk reflectance if a defective area is detected in the data block as a result of the defective area checking; Determining whether the reflectance of the checked optical disk is a predetermined reflectance; Searching for a defect entry number of the data block and deleting defect entry information when the checked reflectance is a preset reflectance; Deleting the ISA A method for restoring a defective area of an optical disc player, comprising The method of claim 1, The method further comprises the step of skipping the detected defective area and moving to the ISA when the checked reflectance is not a predetermined reflectance. The method of claim 1, And the defect entry information is stored in the TDMA.

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