08-09-2012 06:57 AM
It depends on what happens to your hard drive. If like you say, it stops working completely, as in stops spinning, etc, then no, the Q partition would be useless at that point. I would definitely make a recovery disc or recovery USB to have a "failsafe". In cases where the hard drive still spins and you have a problem with a virus or your OS then yes, it's possible to restore from the Q drive.
Hope that helps,