Sector servo seek control
Patent 4488189 Issued on December 11, 1984. Estimated Expiration Date: 
August 16, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 16, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 4030132 Motion control system Servo system for track accessing and track following in a disk drive Sampled data servo positioning system Servo system for data storage apparatus Patent #: 4400747 InventorsApplicationNo. 06/414285 filed on 08/16/1982US Classes:360/78.04, For rotary carrier (e.g., disc)318/571, With "feed-rate" control360/78.06, Specified velocity pattern during access360/78.09Including model of servo system or elementExaminersPrimary: Kilgore, Robert M.Attorney, Agent or FirmInternational ClassesG11B 21/08 (20060101)G11B 5/55 (20060101) AbstractA sector servo seek control samples each sector to obtain sector time, the track identification within a sequence of track types and a position error signal for a track location to track location seek. The device during each sector determines the actual transducer track location and the next sector projected track location with respect to the sequence of track types. The projected track location is corrected using the error signal to find the actual location, but if a sector signal is missing or erroneous, the projected location is used as the actual location, permitting a composite correction to be made when a correct sector signal is obtained. The seek time is minimized by using maximum acceleration followed by maximum deceleration while not exceeding a velocity value that would cause the device to overshoot the target track using full deceleration.Other References
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