Disk drive controller

Details Disk drive controller Disk drive controller

1988-12-06

1990-04-10

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Pulse crowding correction

G11B 509

Patent

active

049165569

ABSTRACT:
The invented controller uses a programmable parameter scheme which makes it possible to read and write 31/2 inch variable and fixed speed drives, as well as standard 51/4 inch drives. Additionally, the present invention uses a plus/minus rate multiplier to correct for symmetry and frequency errors. Also provided is a form of read post compensation which corrects for peak shift effects on disks with insufficient precompensation. Other advanced features of the present invention include the use of half clock circuits to provide half clock resolution in the signal being written to and read from the disk and the capability of operating at continuously variable clock speeds and data rates dynamically programmable by the computer.

REFERENCES:
patent: 4081756 (1978-03-01), Price et al.
patent: 4281356 (1981-07-01), Sousa
patent: 4327383 (1982-04-01), Holt
patent: 4344093 (1982-08-01), Huber

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