公开(公告)号：JPH10269728A

公开(公告)日：1998-10-09

申请号：JP7551597

申请日：1997-03-27

Applicant: IBM

Inventor： UEDA TETSUO ,  SATO KIYOSHI ,  ONO HIROYUKI ,  WADA TOSHIAKI

IPC: G11B5/55 ,  G11B19/02 ,  G11B19/04 ,  G11B21/08 ,  G11B21/10

Abstract: PROBLEM TO BE SOLVED: To raise the allowable value of the track width direction velocity of a head immediately after the end of seek operation in which the head position is unstable in order to prevent the off-track recording by inhibiting the write operation of head when the track width direction velocity of head exceeds the allowable value. SOLUTION: With the data writing instruction, a hard disk controller HDC 10 controls a micro-processor unit MPU 6 to move a magnetic head 2 to the target track. HDC 10 causes the magnetic head 2 to move on the target track through the track following control with a position error RES signal supplied from a servo sector reproducing unit 8a to start the write operation. In the writing operation at the off-track position, since the adjacent track data may probably be broken, the allowable position error of the magnetic head 2 is set and when PES from the target track exceeds the allowable position error, the write operation is inhibited. Moreover, when the track width direction velocity of magnetic head is higher than the allowable value, since PES may probably exceed the position error, the write operation is inhibited.