Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
1998-02-03
2000-06-13
Kim, W. Chris
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
360 53, G11B 509
Patent
active
060756640
ABSTRACT:
A write current is set to be an optimum write current. The write current is supplied to a recording head when information is recorded on a recording medium. First margin characteristics are measured which are used for obtaining a lower limit value of the write current to be supplied to the recording head. Second margin characteristics are measured which are used for obtaining an upper limit value of the write current to be supplied to the recording head. As the lower limit value of the write current, a write current value is set for which a margin has a predetermined value in the first margin characteristics. As the upper limit value of the write current, a write current value is set for which a margin has a predetermined value in the second margin characteristics. As the optimum write current, a write current is set which has a middle value between the lower limit value of the write current and the upper limit value of the write current.
REFERENCES:
"Adaptive Magnetic Write Width Control", IBM Technical Disclosure Bulletin, vol. 35, No. 6, pp. 86-88, Nov. 1992.
Fujitsu Limited
Kim W. Chris
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