I thought I'd upgrade from my class 4 16 GB Sandisk microSD card to a class 10 32 GB Adata card. I put the new card in the phone, booted it up, formatted the card, then copied all my data back over from my computer, but the phone took forever to read the card, wasn't loading music, pictures, etc. So I rebooted. After rebooting, the phone would freeze while loading the contents from the card. This happened twice. I finally gave up and put the old card back in the phone and now it's OK again. Should I assume that my Droid 2 is simply too old to be able to run a high capacity, high speed card, or should I assume that the card was bad out of the box?