I have centos 5.3 installed on a server.
I have a Seagate 1TB USB hard disk partitioned, formatted as ext3 and with data on it. When I plug it into my desktop linux pc I get a device /dev/sda1 which I can mount.
However when I plug this hard disk into the centos 5.3 server the only thing which is shown in the dmesg output is :-
usb 1-7: new high speed USB device using ehci_hcd and address 3
usb 1-7: configuration #1 chosen from 1 choice