USB devices on RHES 5.1 not detected

[sunhux G]

Hi,

On our RHES 4.6, when I insert a thumb drive into the USB
port, it will autodetect & "df -k" will show /.../usbdisk

However, on our RHES 5.1 AP, I can't see it when I inserted
an external portable 2.5" hard-disk into the USB.

I'm not sure if my colleague has hardened it - if so how do I
turn in on back?


Thanks
U