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Erasing method for duplicative optical disc

A technology of optical discs and laser diodes, applied in optical recording/reproduction/erasing methods, optical erasing systems, etc., capable of solving problems such as erasure failure and data loss

Inactive Publication Date: 2005-12-14
LITE ON IT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the CD recorder cannot detect the LPP data block to determine the position to stop erasing, the CD recorder will continue to execute the erase operation on the track, resulting in data loss or erase failure

Method used

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  • Erasing method for duplicative optical disc
  • Erasing method for duplicative optical disc
  • Erasing method for duplicative optical disc

Examples

Experimental program
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Embodiment Construction

[0025] Taking a rewritable DVD-RW disc as an example, since the track length represented by each LPP data block can record the data volume of one ECC Block. Therefore, when an optical disc recorder writes to a DVD-RW disc, it must be written in units of ECC Block data, wherein each ECC Block data is accompanied by its ECC Block address.

[0026] According to the description of the DVD-RW specification, each ECC Block encodes 2K Byte data (Main Data) and assigns an ECC Block address. The encoded ECC Block must undergo 8 to 16 Modulation (8 to 16 Modulation) to generate a recording data signal that conforms to the length compression restriction code (2, 10), which means RLL (2, 10) (Run-Length-Limited) (Recording Data Signal). Finally, the recording data signal is converted into a write pulse signal (Write Pulse Signal) to drive the laser diode and complete the action of writing to the DVD-RW disc.

[0027] In the writing mode, the control chipset in the disc recorder will con...

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Abstract

The present invention is CD-RW erasing method. When DVD-RW is erasing in CD baking machine, write-in mode is adopted to replace traditional erasing mode. Under write-in mode, the current value in each current path of laser diode drive circuit is so set that when the write-in pulse signal changes, the laser diode can always output erasing power to DVD-RW. After the starting position of DVD-RW is determined, the CD baking machine writes in n error correcting blocks of data to complete the erasing job. The present invention has no need of detecting pre-pit data block to find out the erase-ending position in DVD-RW.

Description

technical field [0001] The present invention relates to a method for erasing a rewritable optical disc, and in particular relates to a method for erasing a DVD-RW optical disc without continuously detecting the pre-groove data block (LPP Data Block). Background technique [0002] Because DVD discs have the characteristics of storing high-capacity data, DVD discs are very suitable for storing high-definition video and audio data with a large amount of data. Furthermore, due to the mass production of DVD recorders, writable DVD discs and rewritable DVD discs have gradually been accepted by consumers for backing up large-capacity data. [0003] According to the DVD-RW specification, on a DVD-RW disc, a pre-groove data block (Land Pre-Pit Data Block, hereinafter referred to as the LPP data block) is recorded between the spiral tracks, and the LPP data block represents DVD - Actual address on RW track. The track length represented by each LPP data block can record the data volu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/0055
Inventor 汪益适张国强陈凌风
Owner LITE ON IT