Data storage apparatus

Details Data storage apparatus Data storage apparatus

G - Physics

11

B

352/21.32

G11B 5/56 (2006.01) G11B 5/596 (2006.01) G11B 17/00 (2006.01) G11B 21/10 (2006.01)

Patent

CA 1079845

DATA STORAGE APPARATUS Abstract Data track position information for data tracks on a stack of recordingdisks 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 access operations are controlled using track crossing information derived from the pre-recorded servo information on the servo surface and 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 band- width of the position error signal derived from the sectored servo infor- mation is increased by adding high frequency components obtained from the continuous servo information on the servo surface. -1-

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