Split field zone data recording

Details Split field zone data recording Split field zone data recording

1992-11-13

1995-06-06

Hajec, Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 48, G11B 509

Patent

active

054227631

ABSTRACT:
A Split (Data) Field Zone Density Recording (ZDR) on a disk drive system is implemented using a disk controller with a servo timer. The servo timer estimates the periodic occurrences of the servo sectors, thereby eliminating the need for look-up tables and complex operating sequences. Whenever a servo sector is detected, a reset signal is sent to the servo timer which then estimates when the next servo sector can be expected. When the next servo sector is expected, the servo timer signals the disk controller. If this return signal from the servo timer occurs during a read/write of a split data sector, the read/write operation is suspended. The disk controller then waits for the next servo sector. After detecting the next servo sector, another reset signal is sent to the servo timer. The disk controller then synchronizes with the data bit stream and subsequently reads the remaining portion of the split data sector.

REFERENCES:
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patent: 5210660 (1993-05-01), Hetzler
Cirrus Logic Data Sheet dated Apr., 1992 entitled "High-Performance PC XT/AT Disk Controller", for the CL-SH360 product.

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