公开(公告)号：JPH05298841A

公开(公告)日：1993-11-12

申请号：JP9988892

申请日：1992-04-20

Applicant: IBM

Inventor： YAMAMOTO SATOSHI ,  YONEDA ISAO ,  SHINJO AKIRA

IPC: G11B21/10 ,  G11B5/55 ,  G11B5/596

Abstract: PURPOSE: To reduce power consumption by thinning out and using servo information at an idle time in a magnetic disk device of a sector servo method head positioning controlling, based on the servo information arranged on respective sectors. CONSTITUTION: In an idle state, the servo information of all the sectors are not used, and the servo information is selected every one sector or two sectors or above, and the head is position controlled only by the irreducible minimum servo information. Then, the power consumption required for calculating position control is reduced, and further, the power source of useless electric circuits in a write-in or read-out system and a servo system are made possible to be turned off. Specifically, when an MPU 35 detects the processing end of the commands of the write-in or the read-out receiving from a host computer 53, sends a parameter showing the idle state to a servo digital data processing circuit 31, when a next command does not arrive at an interface 51 from the computer 53 and generates a power control signal PWPS based on the servo information from the circuit 31.