公开(公告)号：CH600481A5

公开(公告)日：1978-06-15

申请号：CH944576

申请日：1976-07-23

Applicant: IBM

Inventor： CASE WILLIAM JOHN PHILIP ,  COMMANDER ROBERT DUNCAN

IPC: G05D3/12 ,  G05B11/36 ,  G11B5/596 ,  G11B21/10

Abstract: Data track positioning information for data tracks on a stack of recording disks is provided by servo information pre-recorded on one surface of the stack. In addition, each data track on the remaining surfaces of the stack has servo information relative to that track pre-recorded in sectors around the track. Track following operations are controlled in a closed loop servo system using on-track position information derived from the sectored servo tracks associated with the track being followed. The bandwidth of the position error signal derived from the sectored servo information is increased by adding high frequency components obtained from the continuous servo information on the servo surface. Track access operations are controlled using track crossing information derived from the pre-recorded servo information on the servo surface.

公开(公告)号：AU1625576A

公开(公告)日：1978-02-02

申请号：AU1625576

申请日：1976-07-26

Applicant: IBM

Inventor： CASE WILLIAM JOHN PHILIP ,  COMMANDER ROBERT DUNCAN

IPC: G05D3/12 ,  G05B11/36 ,  G11B5/596 ,  G11B21/10 ,  G11B5/012 ,  G11B5/58

Abstract: Data track positioning information for data tracks on a stack of recording disks is provided by servo information pre-recorded on one surface of the stack. In addition, each data track on the remaining surfaces of the stack has servo information relative to that track pre-recorded in sectors around the track. Track following operations are controlled in a closed loop servo system using on-track position information derived from the sectored servo tracks associated with the track being followed. The bandwidth of the position error signal derived from the sectored servo information is increased by adding high frequency components obtained from the continuous servo information on the servo surface. Track access operations are controlled using track crossing information derived from the pre-recorded servo information on the servo surface.

公开(公告)号：DE2629710A1

公开(公告)日：1977-01-27

申请号：DE2629710

申请日：1976-07-02

Applicant: IBM

Inventor： CASE WILLIAM JOHN PHILIP ,  COMMANDER ROBERT DUNCAN

IPC: G05D3/12 ,  G05B11/36 ,  G11B5/596 ,  G11B21/10 ,  G11B5/012 ,  G11B5/55 ,  G11B27/10

Abstract: Data track positioning information for data tracks on a stack of recording disks is provided by servo information pre-recorded on one surface of the stack. In addition, each data track on the remaining surfaces of the stack has servo information relative to that track pre-recorded in sectors around the track. Track following operations are controlled in a closed loop servo system using on-track position information derived from the sectored servo tracks associated with the track being followed. The bandwidth of the position error signal derived from the sectored servo information is increased by adding high frequency components obtained from the continuous servo information on the servo surface. Track access operations are controlled using track crossing information derived from the pre-recorded servo information on the servo surface.