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Toshiba Corporation Digital Media Network Company
Page 27 of 153
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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.