Fujitsu MPB3052AT, MPB3054AT, MPB3032AT, MPB3021AT, MPB3043AT Self-calibration execution timechart

4.5.2Execution 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 30 minutes.

Table 4.1 Self-calibration execution timechart

	Time elapsed	Time elapsed (accumulated)
1	At power-on	Initial calibration
2	About 30 minutes	About 30 minutes
3	About 30 minutes	About 60 minutes
4	About 30 minutes	About 90 minutes
5	About 30 minutes	About 120 minutes
6	About 30 minutes	About 150 minutes
7
.
.	Every about 30 minutes
.
9

4.5.3Command 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.

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