LenC, if this old thread:
VAIO HDD Protection **Issues** is any indication, a possible "system freeze" could be the reason why the user has to activate it.
Don't know the laptop model, but this
VAIO SZ58GN/C write-up says, under VAIO HDD Protection (scroll to the bottom):
Quote:
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VAIO SZ58GN/C also offers a utility application for this function. Users can adjust the detection level of the acceleration sensor depending on usage. In a car or on a train, where frequent vibration cannot be avoided, change the sensor setting to "low" so that VAIO HDD Protection won't get engaged unnecessarily.
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See if your laptop comes with that utility.