Method and apparatus for determining erasing power of rewritable optical disk

Abstract

The invention provides a method and device to decide the erasure power of rewritable CD, which comprises steps, first set multiple erasure testing powers for CD; use one appointed CD write power and multiple erasure testing powers to run write testing for CD, obtain erasure testing power parameter corresponding to every CD, which reflects CD erasure effect, such as the shake value of data to clock; build variant relation of the parameter and CD erasure testing power according to erasure testing power and corresponding parameter to determine an erasure power for the rewritable CD. The corresponding variant relation comprises a parabolic relation about the parameter and erasure testing power; by the relation, obtain an optimum erasure power on particular write condition. Using the determined CD erasure power to rewrite CD is more complete and reliable.

Description

Background technique [0001] The invention relates to the field of optical storage, in particular to a method and a device for determining the erasing power of a rewritable optical disc. [0002] With the rapid development of digital information technology, optical discs have become more and more important information storage media due to their advantages of large capacity, portability, low cost and non-contact reading. Optical discs include read-only discs (mainly CD-ROM), recordable discs (eg CD-R, DVD-R) and rewritable discs (eg CD-RW, DVD-RW). Erasable and rewritable optical discs mainly include magneto-optical discs (MO, Magneto-Optical Disk) and phase-change optical discs (Phase-Change Disk). [0003] The recording principle of phase-change optical discs is achieved by utilizing the phase change of the material structure of the optical disc recording layer. Generally, the recording layer material of an optical disc has different phases at different temperatures. At roo...

AI Technical Summary

Problems solved by technology

[0006] However, the erasing power determined according to the ATIP or ADIP information in the disc is only the erasing power obtained according to a general ratio ε, not the best erasing power under specific recording conditions, and the best erasing power cannot be guaranteed effect, so there will be more residual signals that cannot be erased, which will affect the rewriting effect of the disc

In addition, some optical discs that do not contain disc writing strategy information may enter the market, so the corresponding writing power value and corresponding erasing power value cannot be obtained from the disc. The disc writing device can only use the default erasing power when writing the disc. However, the default erasing power may be far from the optimal erasing power that can be used under specific recording conditions.

In some cases, the optical disc writing device will not be able to rewrite due to the lack of erasing power

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