When you say "corrupted", would it exhibit the following behavior when trying to sync or download music?
I have tried to load the same 3 or 4 albums several times, but while the last one loaded will play fine, the prior folders will either be empty or the phone gives me the following error code c00d36c4 and say my phone can't play this file.
Also, if I shoot a video it will not play back, but works ok if I switch to storage on my phone.
I am using a samsung 64 GB micro SD card in a Nokia Lumia 521.