External USB Disk Drive not working

My TOSHIBA DISK DRIVE 80GB has stopped working all of a sudden. When i connect the USB drive its shows that USB device connected. But I am unable to find the USB drives in “My Computer”

I tried on other systems,changing the chord, and also the card that is connected to the Drive, but unfortunately the result is the same.

I have almost 60Gb of personal data on the drive, please help me???

Thanking you all in davance
AR