As an external drive it's OK if not a little slow.
As a possible replacement drive for your notebook, FORGET IT!.
The internal drive is hard wired to be noting but a USB drive and there is no way to use it as a replacement drve (using apps like super-duper on the MAC or Casper XP in windows).
We bought two of these drive as backups for our clients notebooks and one had a disk crash so (as we have done many times before with other backup drives) we opened the external case and were shocked that you cannot use the drive as a backup.
The drive is really to large and costly for just extra storage as a USB drive so I would recommend something smaller and another brand.
It's a shame that WD did this because I have up to this point use their drives almost exclusively as backups for the fleet of notebooks we have in the field. We have since moved over to another brand. You have to have a brand you can trust.
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