Well, there is a way, but i'm not gonna say cuz...
"instant and un-warned ban"
Actually, now that I think about it... I have never yet been corrupted! And I always move my memory card back and forth midgame and everything. Hmmm....
Mind you, it COULD BE because my luck is 26! eheheh...
Lol.
You can only move PSO files beetween mem. cards.