公开(公告)号：JPH11191274A

公开(公告)日：1999-07-13

申请号：JP35780797

申请日：1997-12-25

Applicant: IBM

Inventor： ASANO HIDEO ,  OKADA KENJI ,  UEDA TETSUO ,  ARAI KOICHI ,  OZEKI HIDENORI

IPC: G11B21/10 ,  G11B5/55

Abstract: PROBLEM TO BE SOLVED: To provide a disk drive device, a seek controller easy to make a narrow track pitch. SOLUTION: The data are recorded by adding an offset to a position of a reproducing head 22 according to the reproducing head 22 according to a yaw θ of a head and the offset ΔW in the track width direction of a recording head. At a reproducing time, the position of the reproducing head 22 is made the position of the recording head 23 at a recording time, the middle position between the position of the recording head 23 at a recording time and the position of the reproducing head 22 at the recording time or a center of a track, and the reproducing is performed.

公开(公告)号：JPH10134516A

公开(公告)日：1998-05-22

申请号：JP28386096

申请日：1996-10-25

Applicant: IBM

Inventor： SAITO TAKAHIRO ,  KIBASHI AKIRA ,  OKADA KENJI ,  OZEKI HIDENORI

IPC: G06F3/06 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18

Abstract: PROBLEM TO BE SOLVED: To minimize the reduction in a data transfer rate by arranging a spare sector at a position in a spare region located in each zone and is away from the disk center from the position of data in which a hardware error has been generated at least by a specific angle or more from the position of hard error being generated. SOLUTION: A zone 0 on a disk includes at least one spare track arranged at a center part in advance and a data region is divided into a data region 1 and a data region 2 by a spare track. When the zone 0 has a defective sector D, a spare track where a spare sector S is located is sought, the data of the spare sector S are read, and a track located at the next sector of the defective sector D is sought, thus reallocating the data of the sector D at the spare sector S at nearly the opposite side for the disk center in the spare track.

公开(公告)号：JPH10134528A

公开(公告)日：1998-05-22

申请号：JP28383196

申请日：1996-10-25

Applicant: IBM

Inventor： OZEKI HIDENORI ,  KIBASHI AKIRA ,  NISHINOMIYA HIROMI ,  SAITO TAKAHIRO

IPC: G11B19/04 ,  G11B20/18

Abstract: PROBLEM TO BE SOLVED: To efficiently execute ERP that is executed to prevent an error when reading a signal on a disk by grouping steps registered in an error recovery procedure(ERP) and selecting and executing a specific step out of the groups according to an error type. SOLUTION: In an ERP and its execution order change system, a host I/F 401 communicates with a host system and reports to a task handler 402 when it receives a command from the host. The task handier 402 sends a read/write system command to a read/write system processing mechanism 405 according to the command type and sends other commands to an other command processing mechanism 403. When an error occurs during a series of processing, a read/write manager 421 notifies of the location where an error occurred to an ERP routine 423 to execute ERP.