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I have used a 64GB TransFlash cars from SanDisk for over 1,5 years and now, after I wrote a large WAV file to it, it started to behave in a strange way:
all the files and folders on it are readable. If I write something to it or even delete a partition it pretends that operations were done successfully, but on next re-read or next card re-mount it turns out that the complete old state has been kept intact, no changes were made.
Is the card damaged permanently?
1If the card comes up as "read-only", then the controller in it has detected alarming trouble and therefore will not allow more writes - in an attempt to allow retaining the data there is. – Hannu – 2015-08-23T12:01:16.110