Magnetic disk apparatus
AssigneeHitachi, Ltd.
InventorsMasaki Odai, Kyo Akagi, Ryuji Tsuchiyama
Life of this patent
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Abstract
A magnetic disk apparatus includes a low-rotation mode for decreasing the revolution number of a disk, in the low-rotation mode, any control signal for decelerating the disk is not generated to permit it to be decelerated owing to inertial drive and when a detected speed falls below a target speed, the disk is accelerated to thereby realize power saving.
Claims5
A magnetic disk apparatus comprising a disk for recording data, a motor for rotating said disk, speed detection means for detecting a speed of said motor and generating a detected speed signal, target speed generation means for generating a target speed signal of said motor, motor control means for generating a control signal of said motor on the basis of the target speed signal and detected speed signal, a head for recording/reproduction operation of data on/from said disk, and an actuator for moving said head, wherein
- said apparatus has a low-rotation mode for decreasing the revolution number of said disk in a time zone in which data is neither recorded nor reproduced and in said low-rotation mode, any control signal for decelerating said disk is not generated by said motor control means to permit it to be decelerated owing to inertial drive and said disk is accelerated when a detected speed falls below a target speed.
Dependencies are inferred from the claim text.