~$ sudo fsck.vfat /dev/sdc
dosfsck 3.0.7, 24 Dec 2009, FAT32, LFN
FSINFO sector has bad magic number(s):
  Offset 0: 0x0180c800 != expected 0x41615252
1) Correct
2) Don't correct (FSINFO invalid then)
? 1
FATs differ but appear to be intact. Use which FAT ?
1) Use first FAT
2) Use second FAT