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C141-E034-02EN 4 - 9
4.5.2 Execution timing of self-calibration
Self-calibration is executed when:
• The power is turned on.
• The disk drive receives the RECALIBRATE command from the host.
• The self-calibration execution timechart of the disk drive specifies self-calibration.
The disk drive performs self-calibration according to the timechart based on the time elapsed from
power-on. The timechart is shown in Table 4.1. After power-on, self-calibration is performed
about every five or ten minutes for the first 60 minutes or six RECALIBRATE command
executions, and about every 30 minutes after that.
Table 4.1 Self-calibration execution timechart
Time elapsed Time elapsed (accumulated)
1 At power-on Initial calibration
2 About 5 minutes About 5 minutes
3 About 5 minutes About 10 minutes
4 About 10 minutes About 20 minutes
5 About 10 minutes About 30 minutes
6 About 30 minutes About 60 minutes
7
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9
Every about 30 minutes
4.5.3 Command processing during self-calibration
If the disk drive receives a command execution request from the host while executing self-
calibration according to the timechart, the disk drive terminates self-calibration and starts
executing the command precedingly. In other words, if a disk read or write service is necessary,
the disk drive positions the head to the track requested by the host, reads or writes data, and
restarts calibration.
This enables the host to execute the command without waiting for a long time, even when the disk
drive is performing self-calibration. The command execution wait time is about maximum 100 ms.