I got:
tc@box:~$ dosfsck -vrf /dev/sdb
dosfsck 3.0.3 (18 May 2009)
dosfsck 3.0.3, 18 May 2009, FAT32, LFN
Checking we can access the last sector of the filesystem
Boot sector contents:
System ID "MSDOS5.0"
Media byte 0xf8 (hard disk)
512 bytes per logical sector
16384 bytes per cluster
32 reserved sectors
First FAT starts at byte 16384 (sector 32)
2 FATs, 32 bit entries
1007616 bytes per FAT (= 1968 sectors)
Root directory start at cluster 2 (arbitrary size)
Data area starts at byte 2031616 (sector 3968)
248452 data clusters (4070637568 bytes)
63 sectors/track, 255 heads
0 hidden sectors
7954432 sectors total
Reclaiming unconnected clusters.
Checking free cluster summary.
/dev/sdb: 135 files, 217847/248452 clusters
Then it's safe to use mount -t vfat?
/Uggla