Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of biasing or erasing
Patent
1994-06-10
1995-07-25
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of biasing or erasing
360 77080, G11B 503, G11B 5596
Patent
active
054367735
ABSTRACT:
The linear range of a servo system for a magnetic storage device using a compared amplitude burst servo pattern and a magneto resistive (MR) sensor is enhanced by reversing the bias current. With the servo bursts displaced to opposite sides of the track centerline, the bias current is reversed to have the read function occur when the sensor is electrically biased to present the higher gain, more uniform end portion of the readback sensitivity profile at the side of the track at which the burst is written. Reversing the bias current in an MR sensor causes the readback sensitivity profile to be mirrored about the sensor center enabling the more uniform portion of the sensor response to be used to sense the respective servo pattern bursts. Where differences occur in MR gain between bias current directions, normalization or other correction is provided to compensate for variation in sensor gain.
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IBM Technical Disclosure Bulletin, vol. 33, No. 5, Oct. 1990, 391-393; "Adjustable Read Bias Current for Enhanced Head Reliability" by G J Kerwin.
International Business Machines - Corporation
Kim Won Tae C.
Lahtinen Robert W.
Psitos Aristotelis
Truelson Roy W.
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