Apparatus for generating an index pulse in a data storage system
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United States of America Patent
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Nov 10, 1992
Grant Date -
N/A
app pub date -
Jul 31, 1990
filing date -
Jul 31, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An index pulse generator in a magnetic storage system reads data from a surface in the magnetic storage system and produces an index pulse. An incrementing sequence of non-zero codes, with redundancy, is written in a series of consecutive servo data frames, immediately preceding, leading up to, and including a specific servo index frame. Error tolerant circuitry reads and decodes the servo frame data, maintains a count of non-zero codes encountered, and generates an index pulse provided that both the desired count of non-zero codes has been reached and that a minimum number of matches between the non-zero frame counter and the actual frame decodes has been satisfied.
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