DISK POWER MANAGEMENT METHOD, COMPUTER PROGRAM, DATA STORAGE DEVICE, AND COMPUTER SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide reliability-aware disk power management.

SOLUTION: A token value is maintained based on an allowable number of low power transitions of a hard disk drive without adversely affecting reliability, compared to an actual number of low power transitions of the hard disk drive. The allowable number of low power transitions increases over the hard disk drive's lifetime. Before the hard disk drive performs a low power transition, the token is evaluated to determine if the hard disk drive is allowed to perform a low power transition. Low power transitions discussed include parking the head and spinning-down the hard disk drive.

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