External usb disk not working (no replies)

Hi all, I recently had a dead disk on a lacie d2 network NAS, and I installed debian.
Almost everything is working fine, except that I can't mount an external usb disk. Here is all the info:

The result of uname -a is

Linux lacie-NAS 2.6.22.7 #1 Mon Oct 25 15:17:58 CEST 2010 armv5tejl GNU/Linux

If I try to modprob usb_storage (I installed linux-source), I get

FATAL: Module usb_storage not found.

After doing mount usbfs -t usbfs /proc/bus/usb, if I do lsusb, I get (the Iomega is the disk)

Bus 002 Device 001: ID 0000:0000
Bus 001 Device 002: ID 059b:0370 Iomega Corp.
Bus 001 Device 001: ID 0000:0000

If I do a dmseg, I get (I connected and disconnected the disk a couple of times)

Init Marvell USB port 0 => HOST
Marvell USB EHCI Host controller #0: c0493600
Init Marvell USB port 1 => HOST
Marvell USB EHCI Host controller #1: c0493400
ehci_marvell ehci_marvell.4523: new USB bus registered, assigned bus number 1
ehci_marvell ehci_marvell.4523: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004
hub 1-0:1.0: USB hub found
ehci_marvell ehci_marvell.167817: new USB bus registered, assigned bus number 2
ehci_marvell ehci_marvell.167817: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004
hub 2-0:1.0: USB hub found
ohci_hcd: 2006 August 04 USB 1.1 'Open' Host Controller (OHCI) Driver
USB Universal Host Controller Interface driver v3.0
usb 1-1: new high speed USB device using ehci_marvell and address 2
usb 1-1: USB disconnect, address 2
usb 1-1: new high speed USB device using ehci_marvell and address 3
usb 1-1: USB disconnect, address 3
usb 1-1: new high speed USB device using ehci_marvell and address 4

The USB disk doesn't show in a fdisk -l​

Any ideas?
Thanks a lot