Disc crack detection method and method of controlling speed...

Details Disc crack detection method and method of controlling speed... Disc crack detection method and method of controlling speed...

2005-04-05

2005-04-05

Edun, Muhammad (Department: 2655)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S053130, C369S044320

Reexamination Certificate

active

06876613

ABSTRACT:
A method of detecting a crack in a disc loaded on a disc drive and a method of automatically lowering a target speed in response to the detection of a crack in order to stabilize the disc drive. According to the methods, it is automatically determined whether a disc loaded on a disc drive has a crack in a specific mode, and a target speed is automatically changed into a low speed when it is determined that the disc has a crack. Therefore, the crack state of the disc is exactly checked during action of the disc drive, the percentage of error occurrence is decreased, and the probability of damage to the disc is reduced.

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Japanese Office Action, dated Mar. 23, 2004.

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