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US 6,785,071 B2Granted
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.
Claims21
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
- adjusting a shape of the write current waveform by adjusting a peak value of the write current waveform following a polarity transition 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 adjust a shape of the write current waveform based on a pattern of the data bits recorded.
A method of magnetically recording data bits on a medium, the method comprising:
- determining a state of the current data bit being recorded on the medium;
- determining a state of at least one of a data bit previously recorded and a data bit subsequently recorded on the medium;
- and
- providing a write current waveform having a shape that is adjusted based on the state of the current data bit being recorded on the medium and the state of at least one of a data bit previously recorded and a data bit subsequently recorded on the medium.
1 more element
Dependencies are inferred from the claim text.