Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1990-11-09
1993-03-02
Dixon, Joseph L.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7715, G11B 5584
Patent
active
051914913
ABSTRACT:
Method and apparatus for reading information recorded on a storage medium in helical tracks, with each track comprising a plurality of blocks of data, and with at least some of said tracks having a plurality of servo zones (ST0, ST1, ST2) recorded thereon. A servo head (S) and read heads (R1, R2) traverse original azimuthal paths, with the read heads (R1, R2) attempting to read data blocks recorded on the stripes and the servo head (S) attempting to pick up signals of the recorded servo zones. A controller (100) acquires information indicative of whether a track is distorted and selects one of the servo zones (ST0, ST1, ST2) as having a specified relationship to a potential track distortion. The controller then rewinds the storage medium and repositions the servo head (S), so that upon re-reading of the medium the servo head (S) follows a modified azimuthal path whereon the signal from the selected servo zone is prioritized relative to the other zones. The read heads (R1, R2) accordingly traverse modified azimuthal paths. In one mode, the information indicative of track distortion is obtained by monitoring unique data block identifying information (BLOCK ID). In another mode, the information indicative of track distortion is obtained from a comparison of the amplitudes of the signals from the servo zones (ST0, ST1, ST2).
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Dixon Joseph L.
Exabyte Corporation
Robertson David L.
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