Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1998-10-22
2000-11-07
Kim, W. Chris
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
G11B 509
Patent
active
061445142
ABSTRACT:
A disk sequencer in a headerless disk drive system includes a format calculator that performs arithmetic processing on a frame number to generate frame parameters that indicate the format of a data frame associated with the frame number. The disk sequencer then uses the frame parameters to identify boundaries of data segments during a read or write. Arguments of the arithmetic processing include the frame number, static parameters that indicate fixed field sizes, and zone parameters that depend on the track. The static and zone parameters can be transferred to the disk sequencer during initialization and a seek respectively. The arithmetic processing is completed during processing of a servo sector to permit zero latency accesses. In one embodiment, the zone parameters are less than two words per zone and include a byte count for an ending partial data sector and a number of full data sectors in a first frame. Thus, a small amount memory and bandwidth is required for storage and transmission of zone parameters. The frame parameters generated include a byte count for a beginning partial data sector, a number of full data sectors in the frame, and a byte count for an ending partial data sector.
REFERENCES:
patent: 5627946 (1997-05-01), Strang, Jr.
Adaptec, Inc.
Kim W. Chris
Millers David T.
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