The power going out shouldn't do anything to a card unless it's being
written to at that moment, which is just very bad luck. If it's corrupting
data when it's not even reading/writing from/to the card then that's messed
up and has nothing to do with PS2 in general, but rather your personal
PS2 being a piece of crap. So maybe what you should hope for is that
you'll get a good PS3.

.opt