公开(公告)号：JPH11167779A

公开(公告)日：1999-06-22

申请号：JP32851797

申请日：1997-11-28

Applicant: IBM

Inventor： ARAI KOICHI ,  KOTANI YASUHIRO ,  KITAGAWA HIROSHI

IPC: G11B19/00 ,  G11B5/54 ,  G11B21/02 ,  G11B21/12 ,  H02P8/12 ,  H02P8/40

Abstract: PROBLEM TO BE SOLVED: To improve reliability of a disk device and to reduce a manufacturing cost. SOLUTION: A retracting circuit 13 receives a current by counter electromotive force from a spindle motor 2 and clips it to

公开(公告)号：JPH05109174A

公开(公告)日：1993-04-30

申请号：JP27346091

申请日：1991-09-26

Applicant: IBM

Inventor： HANABUSA HIROSHI ,  KOTANI YASUHIRO ,  SATOU NOBUAKI ,  YAMAMOTO OSAMU

IPC: G06F3/06 ,  G06F13/00 ,  G06F13/10 ,  G06F13/38 ,  G11B19/02 ,  G11B19/20

Abstract: PURPOSE: To add a new function to a peripheral device without adding change on a hardware to an interface part by providing a means for making an operation different from a specified operation be performed in response to detection by a detection means. CONSTITUTION: To this floppy disk device 231, a response means 53 for sending track 0 signals to the side of a system main body 201 in response to the detection means 51 is added. The track 0 signals are used so as to report that the side of the floppy disk device 231 receives the command of the change of a motor rotation number to the side of the system main body 201. At the time of changing the motor rotation number by sending step signals to the floppy disk device 231, the physical position of a head 37 immediately before generating a first step signal is required to be on a track 0. When the step signals are issued for three times with the intervals of 8ms under such a condition, the track 0 signals become active and the rotation number of a spindle motor 37 is changed from 360rpm to 300rpm.