Even more upsetting is the behavior of the seller. 7 months ago I bought the card and use them in my phone since. After exactly 7 months, she has given up the ghost then and deprived me of any write access. Private files such as photos and videos are virtually "baked". Every imaginable deletion or formatting attempt (even have a Linux distribution via GParted live CD booted) was unsuccessful.
The trader "Memory Man" has rejected my demand by referring to the 6 month long warranty and respond since no longer on my request.
Product is quite OK, if you do not get defective card.
Customer friendliness and service, however, are an impertinence!