公开(公告)号：DE69700749D1

公开(公告)日：1999-12-09

申请号：DE69700749

申请日：1997-03-25

Applicant: IBM

Inventor： OTTESON HAL HJALMAR ,  SMITH GORDON J

IPC: G11B19/00 ,  G11B19/02 ,  G11B20/10 ,  G11B20/12

Abstract: A multiple frequency zoned disk storage device in which data is read from and/or written to the disk at two or more discrete disk velocities is disclosed. The disk storage device includes a low power mode where information is read/written from/to the disk while the disk velocity is reduced to conserve power. The allocation track locations into zones on the drive reduces the number of zone bit frequencies the storage device must handle.

公开(公告)号：DE69700749T2

公开(公告)日：2000-06-08

申请号：DE69700749

申请日：1997-03-25

Applicant: IBM

Inventor： OTTESON HAL HJALMAR ,  SMITH GORDON J

IPC: G11B19/00 ,  G11B19/02 ,  G11B20/10 ,  G11B20/12

Abstract: A multiple frequency zoned disk storage device in which data is read from and/or written to the disk at two or more discrete disk velocities is disclosed. The disk storage device includes a low power mode where information is read/written from/to the disk while the disk velocity is reduced to conserve power. The allocation track locations into zones on the drive reduces the number of zone bit frequencies the storage device must handle.

公开(公告)号：SG42874A1

公开(公告)日：1997-10-17

申请号：SG1996000357

申请日：1993-11-19

Applicant: IBM

Inventor： GOOD DANIEL LEE ,  MASON JEFFREY ERIC ,  OTTESON HAL HJALMAR

IPC: G11B5/54 ,  G11B5/60 ,  G11B19/04 ,  G11B19/20 ,  G11B21/21 ,  G11B33/10 ,  G11B17/32 ,  G11B5/58

Abstract: The fly height of read/write heads in multiple disk drives is dynamically adjusted to optimum fly height by a servo loop. The fly height is sensed in real time with a harmonic ratio fly height detector and compared to an optimum or reference fly height. The suspension system of each head is adjusted in accordance with the departure of the fly height of that head from the optimum fly height. The adjustment of the suspension system is accomplished by bonding a piezoelectric film to the flexible suspension arm carrying each head. The fly height is corrected for both radial and circumferential error as the head changes radial and circumferential position relative to the disk surface. The reference fly height, to which each head is moved by the servo loop, may be selectively changed in the fly height servo operation. This can be done to lift the heads away from the disk surface during track seek mode or disk drive sleep mode. The reference fly height can also be changed to lower the heads towards the disk surface during error recovery mode.