can't mount 300G USB drive that's FAT32

[Dan Finn]

the system sees the disk:
Jun 24 15:37:30 stewie kernel: umass0: Maxtor OneTouch, rev 2.00/2.00, addr 2
Jun 24 15:37:30 stewie kernel: umass0: Get Max Lun not supported (STALLED)
Jun 24 15:37:31 stewie kernel: GEOM: create disk da0 dp=0xc2d85050
Jun 24 15:37:31 stewie kernel: da0 at umass-sim0 bus 0 target 0 lun 0
Jun 24 15:37:31 stewie kernel: da0: <Maxtor OneTouch 0201> Fixed
Direct Access SCSI-0 device
Jun 24 15:37:31 stewie kernel: da0: 1.000MB/s transfers
Jun 24 15:37:31 stewie kernel: da0: 286103MB (585938944 512 byte
sectors: 255H 63S/T 36473C)

this is a Maxtor 300G USB drive.  A backup was written to it via a
linux 2.4 server and now I would like to mount it on my FBSD laptop to
read it and work with the files.

When trying to mount it using mount_msdos I get the following:
[ root @ stewie : ~] : mount_msdosfs -o rw /dev/da0s1 /mnt/usb1/
mount_msdosfs: /dev/da0s1: Invalid argument

and in /var/log/messages I get the following:
Jun 24 15:43:52 stewie kernel: mountmsdosfs(): disk too big, sorry

when trying to use ntfs to mount it I get :
[ root @ stewie : ~] : mount_ntfs /dev/da0s1 /mnt/usb1/
mount_ntfs: /dev/da0s1: Invalid argument
and nothing in any log file.

One of the taks I need to accomplish here is to copy all of the data
on this 300G USB drive onto an identical 300G USB drive.  I was going
to mount both and just copy from one to the other.  After reading
about the limited writing capabilities in the man page of mount_ntfs
I'm wondering if I would be better off doing this on a linux box.  The
linux box that created the origional backup onto the USB drive had no
problem creating the Fat32 filesystem and writing to it.

Any ideas?