Positioning system for data storage apparatus

Details Positioning system for data storage apparatus Positioning system for data storage apparatus

G - Physics

11

B

352/21.33

G11B 21/08 (2006.01) G11B 5/55 (2006.01) G11B 5/596 (2006.01) G11B 5/82 (2006.01)

Patent

CA 1078512

POSITIONING SYSTEM FOR DATA STORAGE APPARATUS Abstract Data storage apparatus comprises a movable record medium with at least one data record-and-playback head for recording data on and/or reading data from tracks on the medium. An actuator moves the data head or heads from track to track as required by external apparatus, the movement being controlled by reference to servo tracks pre-recorded on the medium and read by a servo head ganged for movement to the data head or heads. Each servo track consists of regions alternating between first and second states, transi- tions from a first to a second state and from a second to a first state being capable of producing different distinguish- ing signals in the servo head. Sections of the servo tracks are laterally displaced with respect to undisplaced sections by a distance less than one track width, the location of the displaced sections being selected such that the lateral displacement of servo tracks at the start and end of a section do not produce changes detectable by the servo head.

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