Method of unbalanced disc detection

Details Method of unbalanced disc detection Method of unbalanced disc detection

2005-11-15

2005-11-15

Edun, Muhammad (Department: 2655)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053120, C369S053140, C369S053190

Reexamination Certificate

active

06965548

ABSTRACT:
A method of unbalanced disc detection in a slim type optical drive. In the method of the present invention, the slim type optical drive obtains a first tracking count per round of the disc at a first rotation speed to obtain a first runout. Then, the optical drive obtains a second tracking count per round of the disc at a second rotation speed to obtain a second runout. Finally, deviation of the disc is assessed according to the first runout and the second runout, so that the disc can be determined to be a gravitationally eccentric disc or not.

REFERENCES:
patent: 6377527 (2002-04-01), Hirashima
patent: 6826136 (2004-11-01), Jeong

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