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If it has been used for a while, then its probably read only and total junk. The controller which scatters the data around (well you hope unless you buy junk memory cards like Maxell which do not even scatter and beyond simple videos and pictures are useless) eventually locks down. Smash it with a hammer and be done with it. If it is under warranty maybe you can get another as suggested. It is interesting how common the read only issue is, and how difficult to detect besides empirically which is somewhat annoying.
As has been noted this is a reason not to defragment the drives. Although most of the thousands or articles which talk about this do not point out that although disk location does not matter, a large purpose in defragmentation is nothing to do with where on the disk the files are or how scattered about their data is, but has to do with the higher level master file table structures which will cause performance issues and complications in data recovery if overly fragmented.
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