Hi,

I have made it working:

In the file /etc/fstab new line:
/dev/scsi/host2/bus0/target0/lun0/part1 /media/hddusb auto defaults 0 0
In the map /media: make a map hddusb.
For a USB 2.5 inch You need 2 USB ports. One for data and one for supply (power). I use the 2 USB ports on the back of the box.
I have formatted the USBdisk as EXT3 and use the program Ext2 volume manager on my laptop to exchange files.
AS I remember on this moment the USB for data is the upper one. (Change it, if it does not work.).
Restart the DM8000. You can see the usbdisk in /media/hddusb.

I have a DVD and a internal disk connected.

I alo have a script for mounting and unmounting the Ussbdisk in xml-format for OpenPLI. If You want it, let me know.
Grtz. Petty.