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US 2003/0189778 A1Published application
Disk drive writer waveform induced precompensation
AssigneeAgere Systems Inc.
InventorsCarl F. Elliott, John D. Leighton
Life of this patent
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Abstract
A disk driver writer precompensation system modulates the write current waveform based on a pattern of data bits magnetically recorded on a medium in order to adjust the timing of magnetic transitions recorded on the medium.
Claims15
A method of magnetically recording a plurality of data bits on a medium, the method comprising:
- generating a write current waveform for direction through a write head in order to record the plurality of data bits on the medium;
- and
- modulating the write current waveform based on a pattern of the data bits recorded.
A write control circuit for magnetically recording a plurality of data bits on a medium, the circuit comprising:
- a write driver operable to generate a write current waveform for direction through a write head in order to record the plurality of data bits on the medium;
- and
- a voltage control circuit operatively coupled to the write driver to affect operation of the write driver to selectively modulate the write current waveform based on a pattern of the data bits recorded.
Dependencies are inferred from the claim text.