# mkudffs -b 512 --media-type=hd --utf8 /dev/sdf
start=0, blocks=64, type=RESERVED
start=64, blocks=12, type=VRS
start=76, blocks=180, type=USPACE
start=256, blocks=1, type=ANCHOR
start=257, blocks=16, type=PVDS
start=273, blocks=1, type=LVID
start=274, blocks=15646189, type=PSPACE
start=15646463, blocks=1, type=ANCHOR
start=15646464, blocks=239, type=USPACE
start=15646703, blocks=16, type=RVDS
start=15646719, blocks=1, type=ANCHOR
# mount -t udf /dev/sdf /mnt/tmp/
mount: wrong fs type, bad option, bad superblock on /dev/sdf,
missing codepage or other error
In some cases useful info is found in syslog - try
dmesg | tail or so

# dmesg | tail
sdf: Write Protect is off
sdf: Mode Sense: 23 00 00 00
sdf: assuming drive cache: write through
sdf: unknown partition table
sd 7:0:0:0: Attached scsi removable disk sdf
sd 7:0:0:0: Attached scsi generic sg5 type 0
usb-storage: device scan complete
UDF-fs: No partition found (1)
UDF-fs: No partition found (1)
UDF-fs: No partition found (1)
# zcat /proc/config.gz | grep UDF
CONFIG_UDF_FS=y
CONFIG_UDF_NLS=y
#

Устройство работающее, раньше там был vfat.