Digital data storage apparatus comprising circuit for reducing r

Details Digital data storage apparatus comprising circuit for reducing r Digital data storage apparatus comprising circuit for reducing r

1992-10-14

1994-04-19

Hajec, Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

360 43, G11B 509, G11B 2014, G11B 2016

Patent

active

053051564

ABSTRACT:
A hard disk drive is disclosed wherein data is so recorded on the disk that a transducer puts out a waveform having a positive peak followed by a negative peak for each bit representative of a logic one of the data. For eliminating the read error that will arise when the disk is accidentally magnetized on its track gaps or other regions which should have been left unmagnetized, a read circuit connected to the transducer is constructed to recreate the recorded data by detecting the negative peaks, instead of the positive peaks, of the transducer output waveform.

REFERENCES:
patent: 3735372 (1973-05-01), Coccagna
patent: 4016599 (1977-04-01), Sherer
patent: 4152731 (1979-05-01), Henry
patent: 4634896 (1987-01-01), Shrinkle

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