Method and apparatus for predicting recovery time of hard disk drive
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorsAkira Kibashi, Hideo Asano, Daniel J. Colegrove
Life of this patent
Estimating the term…
Abstract
A method and an apparatus for predicting the recovery time required until the hard disk drive is restored to a usable state from a stand-by state. The recovery time is a time required until the hard disk drive is restored to a usable state from the stand-by state. Then, the predicted recovery time is reported to the host system. When the host system knows how much time is needed until the disk drive is recovered, it can schedule a task to be completed before the hard disk drive is restarted, thereby scheduling of all the tasks in the host system can be optimized.
Claims1
A method for predicting a recovery time of a hard disk drive connected to a computer, said disk drive including an actuator and a spindle motor to rotate a disk, comprising:
- predicting the recovery time of the hard disk drive from a stand-by state to a usable state when the hard disk drive receives a request from the computer to exit the stand-by state;
- and,
- reporting the predicted recovery time of the hard disk drive to the computer,
- wherein the recovery time is predicted with the formula:
- tr=ts+tv
- wherein ts is the time for restarting the spindle motor of the hard disk drive, tv is the time for moving the actuator of the hard disk drive to a predetermined location over the disk, and tr is the recovery time of the hard disk drive.
Dependencies are inferred from the claim text.