Inventors:
Gina R. Danner - Inver Grove Heights MN
Evgeny J. Berzon - Minneapolis MN
Assignee:
Seagate Technology, Inc. - Scotts Valley CA
International Classification:
G11B 509
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.