I bought a similar one last year and it was not recognised by the PC so I ended up removing the HDD and installing it as an internal drive.
Did you try the drive in windows first? I have had an external drive (seagate i believe) before that gave problems mounting in linux if it had previously been mounted in windows and then uncleanly removed. This problem was fixed by rebooting into windows and faffing around to 'safely remove hardware' or some such.
Ricky