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9.5 Load/Unload

Be sure to issue and complete the following commands for unloading before cutting off the power supply.

Following table shows the specification for normal load/unload cycles.

Load/unload cycle (Times)

Environment

600,000

Room temperature

300,000

Operational temperature range

Unload is executed by the following commands :

・Standby

・Standby Immediate ・Sleep

・Hard reset

Load/Unload is also executed as one of the idle modes of the drive.

If power is removed from the drive while the heads are over the media an Emergency Unload will take place. An Emergency Unload is performed by routing the back-EMF of the spindle motor to the actuator voice coil. An Emergency Unload is mechanically much more stressful to this drive than a controlled Unload. The minimum number of Emergency Unloads that can be successfully performed is 20,000. Emergency Unload should only be performed when it is not possible to perform a controlled Unload.

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