Kernel panic on mounting flash drive..

Hi,
     I use FreeBSD 6.0-CURRENT on my AMD athlon XP pc.  I observed
that the system  is getting hanged whenever I am trying to mount my
sandisk flash drive.
I use the following command to mount the drive:
$ mount -t msdos /dev/da0s1 /mnt

I observed the following message in /var/log/messages just before the reboot:
=================
May  7 11:43:17 sssss fsck: /dev/ad0s2f: CANNOT CREATE SNAPSHOT /home/.snap/
fsck_snapshot: No such file or directory
May  7 11:43:17 sssss fsck:
May  7 11:43:17 sssss fsck: /dev/ad0s2f: UNEXPECTED INCONSISTENCY; RUN fsck
MANUALLY.
=================
I ran fsck and tried to remount the drive but ended up with system hang.

The sustem is properly identifying the drive
==================================
May  7 11:55:16 sssss kernel: ums0: vendor 0x0461 USB Mouse, rev 1.00/1.01,
addr 2, iclass 3/1
May  7 11:55:16 sssss kernel: ums0: 3 buttons and Z dir.
May  7 11:55:16 sssss kernel: umass0: SanDisk Corporation Cruzer Mini, rev 2
.00/1.25, addr 3
==================================