getting a device for an usb tape drive


Hello,
I am trying to use an HP DAT72 tape drive (USB version) on a Linux machine with Debian Etch, kernel 2.6.21.
After plugging the thing, and giving "modprobe usb_storage", it is recognized (see messages below).
Dmesg says that it is st1 / sg4.
However, these devices /dev/st1 and /dev/sg4 are not there. They cannot be used.
I understand (barely :-)) that udev should create them. But they aren't there.
What should I do?

Thanks,
Giovanni


---------------------------------------------------------
dmesg

st 7:0:0:0: Attached scsi tape st1
st 7:0:0:0: st1: try direct i/o: yes (alignment 512 B)
st 7:0:0:0: Attached scsi generic sg4 type 1

---------------------------------------------------------
cat /proc/scsi/scsi

Host: scsi7 Channel: 00 Id: 00 Lun: 00
Vendor: HP Model: C7438A Rev: ZU75
Type: Sequential-Access ANSI SCSI revision: 03

---------------------------------------------------------
lshw

*-usbhost
product: EHCI Host Controller
vendor: Linux 2.6.21-2-686 ehci_hcd
physical id: 1
bus info: usb@7
logical name: usb7
version: 2.06
capabilities: usb-2.00
configuration: maxpower=0mA slots=6 speed=480.0MB/s
*-usb
description: Generic USB device
product: DAT72 USB Tape
vendor: Hewlett Packard
physical id: 3
bus info: usb@7:3
logical name: scsi7
version: 30.30
serial: 4855310628553047
capabilities: usb-2.00 emulated scsi-host
configuration: driver=usb-storage maxpower=2mA speed=480.0MB/s
*-tape UNCLAIMED
description: SCSI Tape
product: C7438A
vendor: HP
physical id: 0.0.0
bus info: scsi@7:0.0.0
version: ZU75
serial: HU10628U0G
capabilities: removable
configuration: ansiversion=3
.

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