usb hdd detection problem

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
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