problem mounting USB drive

[Ott Köstner]

Greetings!

Please help with the following issue:

I am trying to mount external USB Windows disk drive to my FreeBSD 
system. After connecting the drive, the following log entries are created:

Aug 10 18:23:56 ott kernel: ugen2.2: <Western Digital> at usbus2
Aug 10 18:23:56 ott kernel: umass0: <Western Digital External HDD, class 
0/0, rev 2.00/2.40, addr 2> on usbus2
Aug 10 18:23:56 ott kernel: umass0:  SCSI over Bulk-Only; quirks = 0x0000
Aug 10 18:23:57 ott kernel: umass0:0:0:-1: Attached to scbus0
Aug 10 18:23:57 ott kernel: da0 at umass-sim0 bus 0 scbus0 target 0 lun 0
Aug 10 18:23:57 ott kernel: da0: <WDC WD16 00BEVE-11UYT0 0000> Fixed 
Direct Access SCSI-0 device
Aug 10 18:23:57 ott kernel: da0: 40.000MB/s transfers
Aug 10 18:23:57 ott kernel: da0: 152627MB (312581808 512 byte sectors: 
255H 63S/T 19457C)

Mounting the drive gives the following error:

# mount -t msdosfs /dev/da0s1 /mnt/
mount_msdosfs: /dev/da0s1: Invalid argument

In the /var/log/messages the following message appears:

Aug 10 18:27:40 ott kernel: mountmsdosfs(): bad FAT32 filesystem

The drive is OK and works fine with Windows. Also, USB flash thumb 
drives work fine, when used in the same manner with my FreeBSD.
System version is 8.0-STABLE, but this is probably irrelevant here.

best regards,
Ott Köstner