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Method for testing critical writing power of CD and related CD-ROM

A technology for testing power and optical discs, applied in optical recording/reproducing/erasing methods, optical recording systems, etc.

Inactive Publication Date: 2005-07-06
BENQ CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the optimal power P opt The selection of P has a better effect on ensuring the quality of the data written to the inner circle of the optical disc 20 to be burned. However, when the optical pick-up head 12 uses the optimum power P opt When writing data to the outer circle of the optical disc 20 to be burned (the outer circle corresponds to a larger optimal power P opt ), may burn the optical disc 20 to be burned due to the different characteristics of the dye covered on the optical disc 20 to be burned or an improper writing strategy (writing strategy).

Method used

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  • Method for testing critical writing power of CD and related CD-ROM
  • Method for testing critical writing power of CD and related CD-ROM
  • Method for testing critical writing power of CD and related CD-ROM

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Embodiment Construction

[0030] The method of the present invention writes the test data into the lead-out area of ​​the optical disc before the optical pick-up head in an optical drive writes the data into the data area of ​​the optical disc, and tests the capability of the optical disc accordingly. After receiving the critical writing power, the optical pickup head of the optical drive is controlled to write the laser light on the optical disk according to the data in a manner not exceeding the critical writing power, so as to avoid burning the optical disk.

[0031] see Figure 4 , Figure 4 It is a schematic diagram of an optical drive 50 accessing data in an optical disc 60 to be burned in a preferred embodiment of the present invention. The optical disc 60 to be burned can be a CD-R, CD-RW, DVD-RW, DVD+R or other types of optical discs. The optical pick-up head 52 used to decode the time data read by the optical pick-up head 52, The eight to fourteen modulators 56 used to modulate the data to...

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Abstract

This invention provides a CD pad threshold write in power test method, which comprises the following steps: a, using optics reading probe to write the test data to the M sections in the first area with different power; b, using the prove to read out the test data in the M sections and computing the error rate within M sections; c, comparing the M test powers and computing the threshold write power according to it.

Description

technical field [0001] The present invention relates to an optical drive, in particular to a method of using the optical drive to test the critical writing power of an optical disc. The power of the laser is less than the critical writing power, so that all data written in the data area can be recognized by the processor in the optical drive. Background technique [0002] In recent years, due to its advantages of small size, low price, and large data storage capacity, optical discs have gradually become a popular data storage medium, and optical drives are used to access data to and from optical discs. [0003] see figure 1 , figure 1 It is a schematic diagram of a known optical drive 10 accessing data into a disc 20 to be burned. The disc 20 to be burned includes a spiral slender shape starting from the center of the disc 20 to be burned. The spiral wobble track 22 is covered with a photoresist layer 24 (not shown). Generally speaking, the track 22 of the optical disc 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/0045
Inventor 林昌辉宋友诚邱珮瑜
Owner BENQ CORP