Magnetic disk apparatus and recording method
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United States of America Patent
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Mar 29, 2011
Grant Date -
Jan 21, 2010
app pub date -
Jun 24, 2009
filing date -
Jul 16, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A magnetic disk apparatus includes a computing unit that obtains data to be recorded on a magnetic disk and computes an intermediate bit length based on a longest bit length and a shortest bit length of bit lengths of the obtained data; an adjusting unit that adjusts a strength of a recording current for recording the obtained data based on a difference between the intermediate bit length and a bit length of the obtained data; and a recording unit that repeatedly detects an error rate for recording data by using the adjusted recording current while narrowing down a track width on the magnetic disk and records the obtained data with a track width corresponding to an error rate detected immediately before an error rate that is detected to be equal to or greater than a predetermined value.
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