Format calculator for headerless hard disk with embedded servo w

Details Format calculator for headerless hard disk with embedded servo w Format calculator for headerless hard disk with embedded servo w

1997-02-28

1999-09-28

Huber, Paul W.

Dynamic magnetic information storage or retrieval

Recording or reproducing an information signal and a control...

360 7804, G11B 502, G11B 5596

Patent

active

059597950

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.

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