"stick the drive in the freezer for a few minutes" - I heard that was one way of removing pin codes on car radios - that does not work either :-)
if you are about to trash it then as a last resort a sharp tap on the central spindle (actually quite hard) while it it spinning - as the head may be actualy stuck (you would hear clicking noises as well)
did you make sure the drive was wired in correctly in the enclosure?.