10.6 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 the power supply is cut when the head is on a media, Emergency Unload is performed by routing the back-EMF of SPM to the voice coil. In this case, Emergency Unload is performed 20,000 times maximum. Emergency Unload should be used only when the host-system cannot perform normal operation.

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