The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 02, 1993
Filed:
Sep. 16, 1991
Gina R Danner, Inver Grove Heights, MN (US);
Evgeny J Berzon, Minneapolis, MN (US);
Seagate Technology, Inc., Scotts Valley, CA (US);
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.