I have checked the map in two different computers with the Heise-Utility H2testw and get similarly poor results on both machines:
Test finished without errors.
You can now delete the test files * .h2w or verify them again.
Writing speed: 5:48 MByte / s
Reading speed: 19.0 MByte / s
H2testw v1.4
When updating of Android Apps on my SGS + from the Google Store writing problems have occurred and the card has been detected only unreliable. With the map eingsteckten the SGS + then also from time to time stuck and has sometimes then simply started again. That's never happened with my 16GB card from Medion. After an exchange on the old map the SGS + running properly again. Because I need space I give the new card for a SDFormat a second chance. Faster they shall not be natural.
Maybe I have bad luck and a "mon production" caught. This description refers to exactly the card that I received. Others may have better luck.
Addendum:
After I reformatted the card, it was exactly one day. The next day I was playing new music on the card and the card has the same rumgezickt again. Android ejects the card. After a reboot, I had several items in LOST.DIR but the music was not there. I claim the card now.
