Address mark detection system for a magnetic disk drive

Details Address mark detection system for a magnetic disk drive Address mark detection system for a magnetic disk drive

1995-05-24

1997-05-06

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Address coding

360 40, 360 7814, G11B 509, G11B 5596

Patent

active

056276931

ABSTRACT:
In a magnetic disk drive of the type using data erase portions as address marks, an address mark detection system has an address mark detecting circuit and a read data masking circuit. The detecting circuit, monitoring a read data signal, becomes active on detecting a data erase portion whose duration is shorter than a predetermined period of time for address mark detection. The detecting circuit is cleared on detecting a data input. The masking circuit, receiving the read data signal, masks any suitable number of read data pulses input immediately after the detecting circuit has been cleared. As a result, even when noise is introduced in the data erase portion, the system prevents the resulting false read data pulses from being output.

REFERENCES:
patent: 4984100 (1991-01-01), Takayama et al.
patent: 5047877 (1991-09-01), Herting

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