Method of CD/DVD vibration detection by monitoring motor...

Details Method of CD/DVD vibration detection by monitoring motor... Method of CD/DVD vibration detection by monitoring motor...

2006-10-31

2006-10-31

Miller, Brian E. (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S047440

Reexamination Certificate

active

07130255

ABSTRACT:
This invention describes a method and apparatus to determine a safe rotational speed for a CD/DVD drive by detecting the amount of vibration of the disk by measuring the operating conditions of the spindle motor. A disk drive includes a motor for rotating the disk and an apparatus for monitoring the current or back emf in the windings of the motor. When the current or the back emf varies from a normal level, the disk is vibrating and a signal indicating a vibration condition is sent to the spindle motor driver. The maximum speed that the disk rotated is slowed until a vibrating condition is no longer detected and the rotational speed associated with a particular disk is based dynamically on the amount of vibration detected. Disks may also be identified that cannot spin a minimum rate of speed.

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