Magnetic disk drive with control of sense current of...

Details Magnetic disk drive with control of sense current of... Magnetic disk drive with control of sense current of...

2005-12-15

2009-12-22

Negrón, Daniell L (Department: 2627)

Dynamic magnetic information storage or retrieval

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

C360S066000

Reexamination Certificate

active

07636212

ABSTRACT:
An output of a magnetic head changes depending on the environmental temperature of a magnetic disk. In particular, under cold temperature conditions, an output of the head largely decreases mainly due to an increase in coercivity of a magnetic recording medium, which degrades an error rate. In one embodiment of the invention, sense-current optimization processing of a magnetic disk drive comprises the steps of: measuring the environmental temperature; and after a sense-current value which is set from the viewpoint of the reliability of the magnetic head is defined as an upper limit, finding out a sense current Is that can achieve the best error rate (BER) at the temperature. While changing a value of the sense current Is inside the magnetic disk drive, an error rate is measured. Then, a sense current Is_opt at which the best error rate properties are achieved is selected as a new set value.

REFERENCES:
patent: 6252731 (2001-06-01), Sloan et al.
patent: 6262858 (2001-07-01), Sugiyama et al.
patent: 2005/0057835 (2005-03-01), Kim et al.
patent: 11-195211 (1999-07-01), None
patent: 2001-023106 (2001-01-01), None
patent: 2004-005852 (2004-01-01), None

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