Accessing tape device from Terminal program using UNIX tar command

I am trying to create some tape backups of very large files (.dmg images) using the UNIX tar command.
I have a 72GB HP 4mm DAT USB drive, which shows up in the system profiler as:
DAT72 USB Tape:
Version: 30.30
Bus Power (mA): 500
Speed: Up to 480 Mb/sec
Manufacturer: Hewlett Packard
Product ID: 0x0125
Serial Number: 4855310528334645
Vendor ID: 0x03f0
But I do not see the device in the /dev/ directory (see below).
Is there a way I can determine the UNIX device name?
Or must I locate and load a driver for this DAT drive?
Thank you
Jeff Cameron
Last login: Mon Jun 9 20:14:36 on ttys000
caladan:~ jeff$ ls /dev/
appleAE0 ptyq7 ptyuc ttyp0 ttyt4
autofs ptyq8 ptyud ttyp1 ttyt5
autofs_control ptyq9 ptyue ttyp2 ttyt6
autofs_nowait ptyqa ptyuf ttyp3 ttyt7
bpf0 ptyqb ptyv0 ttyp4 ttyt8
bpf1 ptyqc ptyv1 ttyp5 ttyt9
bpf2 ptyqd ptyv2 ttyp6 ttyta
bpf3 ptyqe ptyv3 ttyp7 ttytb
console ptyqf ptyv4 ttyp8 ttytc
cu.Bluetooth-Modem ptyr0 ptyv5 ttyp9 ttytd
cu.Bluetooth-PDA-Sync ptyr1 ptyv6 ttypa ttyte
cu.Palm ptyr2 ptyv7 ttypb ttytf
cu.modem ptyr3 ptyv8 ttypc ttyu0
disk0 ptyr4 ptyv9 ttypd ttyu1
disk0s1 ptyr5 ptyva ttype ttyu2
disk0s3 ptyr6 ptyvb ttypf ttyu3
disk1 ptyr7 ptyvc ttyq0 ttyu4
disk1s1 ptyr8 ptyvd ttyq1 ttyu5
disk1s3 ptyr9 ptyve ttyq2 ttyu6
disk1s5 ptyra ptyvf ttyq3 ttyu7
disk2 ptyrb ptyw0 ttyq4 ttyu8
disk2s1 ptyrc ptyw1 ttyq5 ttyu9
disk2s10 ptyrd ptyw2 ttyq6 ttyua
disk2s11 ptyre ptyw3 ttyq7 ttyub
disk2s2 ptyrf ptyw4 ttyq8 ttyuc
disk2s3 ptys0 ptyw5 ttyq9 ttyud
disk2s4 ptys1 ptyw6 ttyqa ttyue
disk2s5 ptys2 ptyw7 ttyqb ttyuf
disk2s6 ptys3 ptyw8 ttyqc ttyv0
disk2s7 ptys4 ptyw9 ttyqd ttyv1
disk2s8 ptys5 ptywa ttyqe ttyv2
disk3 ptys6 ptywb ttyqf ttyv3
disk3s1 ptys7 ptywc ttyr0 ttyv4
disk3s3 ptys8 ptywd ttyr1 ttyv5
disk3s5 ptys9 ptywe ttyr2 ttyv6
dtrace ptysa ptywf ttyr3 ttyv7
dtracehelper ptysb random ttyr4 ttyv8
fbt ptysc rdisk0 ttyr5 ttyv9
fd ptysd rdisk0s1 ttyr6 ttyva
fsevents ptyse rdisk0s3 ttyr7 ttyvb
klog ptysf rdisk1 ttyr8 ttyvc
lockstat ptyt0 rdisk1s1 ttyr9 ttyvd
machtrace ptyt1 rdisk1s3 ttyra ttyve
null ptyt2 rdisk1s5 ttyrb ttyvf
profile ptyt3 rdisk2 ttyrc ttyw0
ptmx ptyt4 rdisk2s1 ttyrd ttyw1
ptyp0 ptyt5 rdisk2s10 ttyre ttyw2
ptyp1 ptyt6 rdisk2s11 ttyrf ttyw3
ptyp2 ptyt7 rdisk2s2 ttys0 ttyw4
ptyp3 ptyt8 rdisk2s3 ttys000 ttyw5
ptyp4 ptyt9 rdisk2s4 ttys1 ttyw6
ptyp5 ptyta rdisk2s5 ttys2 ttyw7
ptyp6 ptytb rdisk2s6 ttys3 ttyw8
ptyp7 ptytc rdisk2s7 ttys4 ttyw9
ptyp8 ptytd rdisk2s8 ttys5 ttywa
ptyp9 ptyte rdisk3 ttys6 ttywb
ptypa ptytf rdisk3s1 ttys7 ttywc
ptypb ptyu0 rdisk3s3 ttys8 ttywd
ptypc ptyu1 rdisk3s5 ttys9 ttywe
ptypd ptyu2 sdt ttysa ttywf
ptype ptyu3 stderr ttysb urandom
ptypf ptyu4 stdin ttysc vn0
ptyq0 ptyu5 stdout ttysd vn1
ptyq1 ptyu6 systrace ttyse vn2
ptyq2 ptyu7 tty ttysf vn3
ptyq3 ptyu8 tty.Bluetooth-Modem ttyt0 zero
ptyq4 ptyu9 tty.Bluetooth-PDA-Sync ttyt1
ptyq5 ptyua tty.Palm ttyt2
ptyq6 ptyub tty.modem ttyt3
caladan:~ jeff$ logout

I downloaded the BRU LE 30 day evaluation, and my first impression is favorable. I still need to perform a bit of testing. The HP drive I have does 36 GB per tape (72 at 50% hardware compression). My first attempt was to back up a single 22 GB .dmg file. Even with no compression it should have fit on one DAT tape, but after backing up 90% of the 22 GB it asked for a second tape. I still have to do more testing, but I very much appreciate the point in the very promising direction.
I will reply again to this thread with my results.
Jeff Cameron

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