Despite a full format after transfer of files on the card 3/4 are missing while exploring windows gives me the card as almost full. A "CHKDSK" card recovers missing 40GB and another transfer is not better. It is useless to have a card of this capacity if it takes a week to charge it while not on the result? For me this is the first and last time I take a memory card with more than 32GB, and strongly discourages this memory card