Programmable data transfer without sector pulses in a headerless

Details Programmable data transfer without sector pulses in a headerless Programmable data transfer without sector pulses in a headerless

1995-09-01

1998-09-22

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 7708, G11B 509, G11B 5596

Patent

active

058123350

ABSTRACT:
A disk controller for headerless disk drive system contains an EOS counter which increments each time a read/write head passes a servo sector. Control words in a data buffer of the disk drive system and event-counts in registers of the disk controller indicate sizes and relative positions of frame fields between the servo sectors. The disk controller decodes control words from a data buffer to determine which fields are in the data frames and determine event-counts for the frame fields. The position of read/write heads in a data frame is then determined by counting pulses of a read or write clock where counting to an event-count identifies a boundary of a frame field. The disk controller synchronizes with the media at EOS pulses and data synchronization fields and otherwise relies on the event-counts and the read or write clock signal. No sector pulses are required because data segments are identified by timing relative to EOS pulses. Assertion of a read gate during a read can be delayed to ensure that variation in the timing of assertion and detection of EOS pulses does not cause a read gate to be asserted before the read/write head reach a data segment.

REFERENCES:
patent: 5075804 (1991-12-01), Deyring
patent: 5255136 (1993-10-01), Machado et al.
patent: 5276564 (1994-01-01), Hessing et al.
patent: 5420893 (1995-05-01), Ward
patent: 5523903 (1996-06-01), Hetzler et al.
patent: 5592348 (1997-01-01), Strang, Jr.
patent: 5627695 (1997-05-01), Prins et al.

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