Dynamic magnetic information storage or retrieval – General processing of a digital signal – Pulse crowding correction
Patent
1991-09-16
1993-11-02
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Pulse crowding correction
360 46, G11B 509
Patent
active
052588769
ABSTRACT:
A data storage system has a rotatable magnetic disc with a plurality of concentric tracks. The system also has read/write circuitry for writing data to the tracks and reading data from the tracks at various frequencies and for pre-compensating the data written to the tracks to compensate for intersymbol interference. Frequency zones are established for the tracks by preliminarily assigning each track to one of a plurality of frequency zones. The pre-compensation is adjusted based on the intersymbol interference which occurs using the preliminary assignment of the tracks to the frequency zones. Data is then written to the tracks and the window margins for the data are tested to see if they meet a threshold window margin. If the window margins do not meet the threshold window margin, the assignment of the tracks to the frequency zones is adjusted and the pre-compensation is also adjusted.
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Berzon Evgeny J.
Danner Gina R.
Canney Vincent P.
Seagate Technology Inc.
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