Disk drive access controller

Details Disk drive access controller Disk drive access controller

1995-03-17

1996-09-24

Nelms, David C.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 47, 369 48, 369 54, G11B 7007

Patent

active

055597653

ABSTRACT:
A data access controller for a disc device is disclosed for accessing data on a disc. A control unit, controlling the disc device, outputs a mode switching signal. A mark detector detects the sector mark and the address mark in read data from a target sector, and outputs a first and second detection signals indicative of the detections of the sector mark and address mark, respectively. In response to the mode switching signal, the mark detector enters a first search mode to detect all data bits of the target sector. A physical address read circuit reads physical address data in the read data in response to the second detection signal, and outputs a synchronizing signal. The format counter receives a basic clock signal to count the number of pulses of the clock signal, and resets its count value to a prescribed value in accordance with the first detection signal and the synchronizing signal to synchronize its count value with the position of the drive head on the target sector. A data processing circuit reads user data in the read data, referring to the count value from the format counter.

REFERENCES:
patent: 5182740 (1993-01-01), Mizokami et al.
patent: 5446724 (1995-08-01), Tabe et al.

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