Thanks for your reply, but it didn't work.
When I mount device, system reply:
"sda1 is not a valide device"
I tried with other device name, but I recived same message.
Perhaps my external interface is not supported, (It give me problems also in windosw: in Windows2000 I can access the disk, but I can not format it or partition it.
I tried also to install linux with this device attached, in order to see if system detected it automatically, but everything was vane........