Out of a pile of 15 SD cards, only trouble has been with the Adata ones. One is completely unreadable now (unable to do anything with in any device) and the other suddenly went to half capacity. Both were only used in the reader.

But then again, at 5 bucks they just aren't worth crying over much. Still sticking with Ridata, Sans and (oddly enough) PNY generally from now on.