You always do not know whether it is because of Windows, because Windows sometimes Windoze is, or on the card or on a self. Anyway, Windows 7 wanted to show this card only if previously formatted - thereby shrunk to only 30GB memory ... ??? After several attempts always result the same ..... INS purely mobile, again formatted - lo and behold, after all memory back to 56 GB .... where the remaining 8 GB are .... I do not know, but now the card is doing at least what they should and my music has finally place on the map , Work since then only via mobile phone to the PC with the card, so that Windoze is not bitchy again ... works so far everything. 1 star dispense, because if I would have bought the card for PC only - I would have nen problem, then it would not really usable ..... But if top.