Apparatus for generating an index pulse in a data storage system

Details Apparatus for generating an index pulse in a data storage system Apparatus for generating an index pulse in a data storage system

1990-07-31

1992-11-10

Dixon, Joseph L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 47, 360 48, 360 49, G11B 2732

Patent

active

051629542

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.

REFERENCES:
patent: 4495533 (1985-01-01), Chambers
patent: 4933786 (1990-06-01), Wilson
patent: 5068755 (1991-11-01), Hamilton et al.

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