Been using a 128GB Samsung EVO with no problems. Just bought a 256GB, copied from player onto new card in adaptor. Put the new card in player & update database seemed to hang after 300 or so files (I have 90% FLAC). Card was formatted as exFAT untouched, but tried to wipe & delete partition/reformat just in case. Ended up with a card that is not registering when put directly in anything, although it does show as an unusable drive when put in another device that is connected via USB cable. chdisk doesn't work, nor diskpart, getting "data error (cyclic redundancy check)". Tried a few recovery tools (not concerned about the contents, just want to get an empty card up & running), but looking like it's a goner.