公开(公告)号：DE69619785D1

公开(公告)日：2002-04-18

申请号：DE69619785

申请日：1996-12-03

Applicant: IBM

Inventor： SMITH GORDON J ,  OTTESEN HAL HJALMAR

IPC: G11B5/39 ,  G11B5/00 ,  G11B5/012 ,  G11B5/596 ,  G11B5/60 ,  G11B21/02 ,  G11B21/10 ,  G11B5/55

Abstract: A dual element (80a,80b) magnetoresistive (MR) head (80) is positioned relative to a storage medium (24) in a storage device (20). The MR head (80) has first and second MR elements (80a,80b). The storage medium (24) is mounted in the storage device (20) to allow relative movement between the MR head (80) and the storage medium (24). The storage medium (24) includes servo information (106,108) provided to induce first and second thermal responses (211,213) in the MR elements (80a,80b). A controller (250) is coupled to the MR head (80) and controls the relative movement between the MR head (80) and the storage medium (24) using the first and second thermal responses (211,213) in the MR elements (80a,80b).

公开(公告)号：PL182005B1

公开(公告)日：2001-10-31

申请号：PL32757996

申请日：1996-12-13

Applicant: IBM

Inventor： SMITH GORDON J ,  OTTESEN HAL H

IPC: G01N25/72 ,  G11B5/00 ,  G11B5/012 ,  G11B5/455 ,  G11B5/55 ,  G11B5/596 ,  G11B5/82 ,  G11B13/00 ,  G11B21/02 ,  G11B27/24 ,  G11B33/10 ,  G11B33/14 ,  G01N25/00

Abstract: The present invention is a method and apparatus for positioning a magnetoresistive (MR) head relative to a storage medium in a storage device. The storage medium is mounted in the storage device to allow relative movement between the MR head and the storage medium. The storage medium includes servo information provided to induce a thermal response in the MR head. A controller controls the relative movement between the MR head and the storage medium using the thermal response induced in the MR head.

公开(公告)号：SG54480A1

公开(公告)日：1998-11-16

申请号：SG1997000853

申请日：1997-03-19

Applicant: IBM

Inventor： SMITH GORDON J

IPC: G11B21/08 ,  G11B5/41 ,  G11B5/55 ,  G11B19/04 ,  G11B23/50 ,  G11B25/04 ,  G11B5/54

Abstract: The invention increases the reliability of a data storage device. The data storage devices contain a memory element disk, containing data, the memory element disk being rotatably mounted about an axis, a transducer head, an actuator for moving the transducer head relative to the disk, and a counter for counting the number of seek operations performed by the transducer head. The invention may include setting a threshold seek value Tseek and comparing this value to the actual seek performed by the head, Vseek, to determine the need for a stop/start operation. Alternatively, the invention includes defining threshold seek operation count Tseek, counting the number of seek operations to determine Mseek since the last stop/start operation, recalling the total number of seek operations completed by the data storage device to define Nseek, defining Dseek by determining the difference between Nseek and Mseek, and determining whether Dseek is equal to or greater than Tseek. When Dseek is equal to or greater than Tseek, the transducer head undergoes a stop/start operation. Mseek may then be reset to equal Nseek before the stop/start operation is undertaken. When Dseek is less than Tseek the count is commenced. The invention may also be used with devices that additionally have auxiliary memory and with arrays of data storage devices.

公开(公告)号：CA2138301A1

公开(公告)日：1995-07-22

申请号：CA2138301

申请日：1994-12-15

Applicant: IBM

Inventor： OTTESEN HAL H ,  CUNNINGHAM EARL A ,  GREENBERG RICHARD ,  BROWN DANA H ,  SMITH GORDON J ,  VANLEEUWEN GEORGE W

IPC: G11B5/012 ,  G11B5/55 ,  G11B5/596 ,  G11B7/0037 ,  G11B19/20 ,  G11B19/247 ,  G11B20/12 ,  G11B21/00 ,  G11B21/02 ,  G11B21/04 ,  G11B27/00 ,  G11B27/10 ,  H04N7/173 ,  G11B7/09