external USB detection problems

I have seagate USB 2.0 HDD which was working good on my windows system

Recently I have started using red hat Linux 2.6.9-55.0.12.EL (i686 i686 i386 GNU/Linux)

The USB is not at all detected in Linux even if I reboot with it attached to the PC. The same can be detected on any Windows system.

Please help as am runnin out of space and I need to copy imp data to the external HDD

I have no issues mounting any external flash, usb or else drive on RHEL, Fedora 8. Do you have X installed, or this is a server ? If you have X/Kde/Gnome, probably the automount daemon isn't started, for the server version try to mount the disk with "mount" with the respective parameters.

Does it appear in the dmesg listing?

What file format are you intending to use on the USB drive?