The subsequent test with H2testw v1.4 revealed no technical faults:
Warning: 30786 30787 MByte tested.
Ready, no error occurred.
Write rate: 17.5 MB / s
Read rate: 19.3 MB / s
After formatting the PC with FAT16, the card has been detected again in the Sony camera - a few pictures later appeared again the system error ... also a test with the Olympus LS-5 Audio Recorder (supports up to 32GB SD card) was negative. The card is recognized in the LS-5 and can be in the unit format itself. A few seconds after you start recording Again erschient an error that can not be saved. Only a PC can describe the map.
Conclusion: I can only advise against the purchase urgently - who relies on this card is left in an emergency!