My experience with external hard drives has not been too good. I had 3 transscend, of which 2 have failed, both within weeks of each other. Maxtor ( or Seagate as they are now) where not interested in solving the problem, which was a failed interface card, not the drive itself. So I don’t buy any transcend or Seagate products any more. For those of you with these particular drives, if your PC fails to recognise the drive then the chance is the interface card has failed.