Fujitsu MPA3035AT, MPA3043AT, MPA3052AT, MPA3026AT, MPA3017AT 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 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
.
.	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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