[CentOS] HP storageworks DAT72 USB external tape drive and centos 4.2

hi,

i've bought at HP storageworks DAT72 USB external tape 
drive and i'm trying to
make it work under centos 4.2

first the hard facts:

os - centos 4.2
kernel 2.4.9-22.0.2.EL
MB - MSI 8kn diamong
4gb ram

the problem is that i don't see the drive.

i'd expected that a device called st0 would appear but 
it's not the case.

watching the messages file when unplugging the device and 
the replugging it
is:

Jan 27 13:47:36 miraculix kernel: usb 1-8: new high speed 
USB device using
address 6
Jan 27 13:47:41 miraculix kernel: usb 1-8: control timeout 
on ep0in
Jan 27 13:47:42 miraculix kernel: usb 1-8: device not 
accepting address 6,
error -71
Jan 27 13:47:42 miraculix kernel: usb 1-8: new high speed 
USB device using
address 7
Jan 27 13:47:47 miraculix kernel: usb 1-8: control timeout 
on ep0in
Jan 27 13:47:48 miraculix kernel: usb 1-8: device not 
accepting address 7,
error -71
Jan 27 13:48:16 miraculix kernel: usb 1-7: new high speed 
USB device using
address 8
Jan 27 13:48:21 miraculix kernel: usb 1-7: control timeout 
on ep0in
Jan 27 13:48:22 miraculix kernel: usb 1-7: device not 
accepting address 8,
error -71
Jan 27 13:48:22 miraculix kernel: usb 1-7: new high speed 
USB device using
address 9
Jan 27 13:48:27 miraculix kernel: usb 1-7: control timeout 
on ep0in
Jan 27 13:48:28 miraculix kernel: usb 1-7: device not 
accepting address 9,
error -71
Jan 27 13:49:01 miraculix kernel: usb 1-1: new high speed 
USB device using
address 10
Jan 27 13:49:07 miraculix kernel: usb 1-1: control timeout 
on ep0in
Jan 27 13:49:07 miraculix kernel: usb 1-1: device not 
accepting address 10,
error -71
Jan 27 13:49:07 miraculix kernel: usb 1-1: new high speed 
USB device using
address 11
Jan 27 13:49:12 miraculix kernel: usb 1-1: control timeout 
on ep0in
Jan 27 13:49:13 miraculix kernel: usb 1-1: device not 
accepting address 11,
error -71


but i don't know what it means.

the documentation on the drives says the the two drivers 
usb_storage and st
should be loaded and the drive should work out of the box.


but it doesn't.

i'm loading both drivers after startup using this command:

modprobe usb_storage

and modbrobe st

what am i missing?????

any help appreciated.

br

kim gabrielsen