| 摘要 |
<P>PROBLEM TO BE SOLVED: To optimize a recording current and a track width. Ž<P>SOLUTION: A magnetic disk apparatus 100 decreases the recording current by the amount corresponding to the increase in the bit length of data to be recorded and increases the recording current by the amount corresponding to a decrease in the bit length of the data, when recording the data while narrowing down the track width on the magnetic disk 110. The magnetic disk apparatus records data by using the recording current while changing a track width to narrow down the track width, determines the track width immediately before the track width for which the error rate of the recorded data becomes equal to or greater than the target error rate, and records the data on the magnetic disk 110 by using the determined track width and the adjusted recording current. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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