High capacity disk drive

Details High capacity disk drive High capacity disk drive

1985-09-13

1988-07-12

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 49, 360 50, G11B 509

Patent

active

047574062

ABSTRACT:
A method of and apparatus for generating and protecting hard sector pulses using the read/write heads of the disk drive without using any external transducers is disclosed. Each track of the disk is pre-formatted with a pattern of a burst of data followed by a short erased gap repeated around the track once per sector. The data bursts are converted to digital pulses which are used to trigger a monostable as long as the read/write heads are positioned over data. The lack of an output signal from the monostable is used to detect the erased gaps. At the end of the erased gap, a sector marker pulse is generated. Various protection signals are also generated. The high capacity hard sectored computer disk drive system disclosed herein utilizes a hard disk which rotates at a speed of approximately 2750 r.p.m. The data received from the host computer for storage on the hard disk is converted to 2,7 RLL coding prior to being written onto the disk. The disk drive system has a formatted data storage capacity in excess of 10 megabytes per disk, using both sides of the disk.

REFERENCES:
patent: 4345280 (1982-08-01), Blagaila et al.
patent: 4366512 (1982-12-01), Janak et al.
patent: 4484176 (1984-11-01), Fitzpatrick
patent: 4554598 (1985-11-01), Tarbox et al.
patent: 4568988 (1986-02-01), McGinlay

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