[all variants] USB hard drive not detected, data recovery possible?

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http://ubuntuforums.org – I assume that there is nothing to do and that my hd is dead, but I thought I'd see if anyone has any interesting information. I have an external usb hd normally pluged into my router running linux, but that I use to perform backups for my work computers running 9.10. There was a power failure recently and the hd is not detected anymore, not by my router, not by my 9.10 notebook. When I plug it it, it does not seem to be detected. Neither, dmesg, nor df indicate that it is detected. I also tested/tried 2 different usb cables. Both work. Any hints for data recovery? I looked at testdisk, but it does not detect the usb hd. (Hardware)