External Seagate drive mount problems ( 3.x / i386 )

I'm trying to mount this external drive but I'm having no success. As
you can see from dmesg ( below ) the drive is correctly recognized.
I get the same response from 3.1 as well. What does "Invalid argument"
mean?

thanks

# mount -t msdos /dev/sd0e /mnt
mount_msdos: /dev/sd0e on /mnt: Invalid argument

-- dmesg output after reboot
NetBSD 3.0 (GENERIC) #0: Mon Dec 19 01:04:02 UTC 2005
...
umass0 at uhub3 port 3 configuration 1 interface 0
umass0: Jabil Circuit Seagate External Drive, rev 2.00/3.00, addr 2
umass0: using SCSI over Bulk-Only
scsibus0 at umass0: 2 targets, 1 lun per target
sd0 at scsibus0 target 0 lun 0: <Seagate, External Drive, > disk fixed
sd0: 149 GB, 16383 cyl, 16 head, 63 sec, 512 bytes/sect x 312581808 sectors

# disklabel /dev/sd0
# /dev/sd0d:
type: SCSI
disk: mydisk
label: fictitious
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 16
sectors/cylinder: 1008
cylinders: 16383
total sectors: 312581808
rpm: 3600
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0           # microseconds
track-to-track seek: 0  # microseconds
drivedata: 0

5 partitions:
#        size    offset     fstype [fsize bsize cpg/sgs]
  d: 312581808         0     unused      0     0        # (Cyl.      0 - 310100)
  e: 312576642        63      MSDOS                     # (Cyl.
0*- 310095*)
disklabel: boot block size 0
disklabel: super block size 0

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