Adaptive prewrite compensation apparatus

Details Adaptive prewrite compensation apparatus Adaptive prewrite compensation apparatus

1989-03-03

1991-09-10

Envall, Jr., Roy N.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 45, 360 51, 360 67, G11B 509

Patent

active

050478761

ABSTRACT:
An adaptive prewrite compensation apparatus for writing data flux transition data on a magnetic medium, the apparatus incorporated in a disk drive assembly. A serial data pattern is introduced into the apparatus from a drive interface in digital form and is encoded. A combination of a transducing head and a writing location used for writing the data pattern on the magnetic medium is determined by the assembly. A predetermined write delay value based on the combination and the data pattern is computed by the assembly which then writes the data pattern on the magnetic medium with reference to the write delay value so that when the data pattern is read back, the flux transitions are preceived to be at the same distance as when entered into the apparatus.

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patent: 4635141 (1987-01-01), Coulter
patent: 4809088 (1989-02-01), Lofgren et al.

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