[quote name='Bubbakja']
Long story short
DO NOT BUY OFFBRAND MEMORY CARDS... please[/quote] [FONT="]SECONDED![/FONT]
Same thing with me and one of those Super Mega Memory PLUS+ Pages PS1 card. Only recoverable save was in a "I'm soooo screwed, need to restart" spot.
Now the only 3rd party "card" I will get is some PC-to/from-Console ones. Plus with the PS2, they come in handy whenever you get a darned "data corrupted, can't delete" error(both Gameshark and Action Replay Max have it, why on earth didn't Sony think to have a reformat option built in?). And another benefit besides backing up progress is being able to download unlocked saves of junk I don't want to bother with....
Of course these can be just as unreliable, I had a Mad Catz PS1 one that the somewhat buggy PC software would erase your card or make your saves worthless. But have had no problems with my Dreamcast, Gamecube, and PS2 ones...
Back on topic, Mad Catz's Gamecube memory card(8 MB I think? Whatever before the 150 block ones) was fine and didn't give me any problems. I still wouldn't trust any unlicensed, not standard(i.e. more memory then a normal PS2 card) 3rd party cards.