[xg917]

aka. press triangle when you are over "memory stick" and then choose information,
-if it says magic gate: unknown (i think thats what it would say) it means its most likely fake (if so, just format it on the computer and it should work better, hopefully)
-if it says magic gate: supported (its real)

most fake sticks are sony sticks. ive never seen a fake sandisk stick.