A friend of mine had a DSTT that had been working for along time when suddenly the sd card became corrupt. The files on the sd card is still visible on a computer, and I managed to backup the saves on card, but I get veery slow transfer and it was not possible to restore/mormat the card. So I replaced it with a new 4GB Sandisk card, and it worked ok for about two weeks, but then the same thing happened again. Then I thought it had to be something wrong with the DSTT, so I ordered a new Acekard for him this time, + 4GB Sandisk. But it only lasted for one day and the same thing happened again!? What to check now? Could it be the dsi itself that destroys the cards? Any ideas?