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C141-E112-01EN
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4.5.2 Execution timing of self-calibration
Self-calibration is executed when:
• The power is turned on.
• 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. After power-on, self-calibration is performed about every 30 minutes and when the
host command is not issued for 15 seconds.
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. Then
restarts calibration if the host command is not issued for 15 seconds.
This enables the host to execute the command without waiting for a long time, even when the disk
drive is performing self-calibration. Only the first command execution wait time is about
maximum 100 ms.