What's the difference between these 2 WD HD's?

[Enzo954]

What's the difference between these 2 WD HD's?

The My Passport Slim and the My Passport Ultra

I'm looking at the 2TB versions and it seems to me that the only difference is the choice in color and that the Slim has a metal case compared to the Ultras plastic case.

 

[Phillip Corcoran]

http://community.wd.com/t5/External-Drives-for-Mac/Difference-My-PassPort-Ultra-My-PassPort-Slim/td-p/665451