TestDisk 6.5, Data Recovery Utility, October 2006
Christophe GRENIER <grenier@cgsecurity.org>
http://www.cgsecurity.org

Disk /dev/sdb - 517 MB / 494 MiB - CHS 494 64 32
     Partition                  Start        End    Size in sectors
 1 * FAT32                    0   1 21   493  63 32    1011660 [Part00]
Boot sector
check_FAT: Unusual, only one FAT
check_FAT: Unusual media descriptor (0xf0!=0xf8)
Warning: Incorrect number of heads/cylinder 1 (FAT) != 64 (HD)
Warning: Incorrect number of sectors per track 1 (FAT) != 32 (HD)
OK

Backup boot sector
test_FAT : Boot sector doesn't have the endmark 0xAA55

First sectors (Boot code and partition information) are not identical.
Second sectors (cluster information) are not identical.
Third sectors (Second part of boot code) are not identical.