Method and apparatus for determining systematic errors
April 8, 2016. 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 ReferencesSide-by-side read/write heads with rotary positioner Apparatus for, and methods of, recording signals in tracks on a memory member without a reference index Method and system for writing a clock track on a storage medium Self servo writing file Method and system for determining a radial positioning valve used for writing tracks at a desired track pitch Method and system for writing a servo-pattern on a storage medium Patent #: 5615058 Inventors
ApplicationNo. 628910 filed on 04/08/1996US Classes:360/51, Data clocking360/75, Controlling the head360/76, Azimuth or skew360/77.08Distinct servo sectorExaminersPrimary: Sniezek, Andrew L.Attorney, Agent or FirmForeign Patent References
International ClassG11B 005/09AbstractImprovements in placement of timing patterns in self servo writing include correcting for random and systematic errors due to geometric effects. In a disk drive having a recording head with separate read and write elements, a method for determining separation between the elements and for correcting for such errors as a function of skew angle between the head and the disk. Errors resulting from misalignment and non-parallelism of the elements as well as misalignment of the head on it its actuator are also detected and corrected. Errors due to changes in rotational velocity of the disk and misplacement of timing patterns with respect to adjacent timing patterns are detected and corrected. In general, a single revolution process may be used to both write and detect random errors on each track and corrected on subsequent tracks.Other References
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