Hello,
The Passport Ultra comes on different capacities from 500 GB to 2 TB with multiple colors this drive comes formatted on NTFS for windows.
The Passport Slim, only come on 1 TB and 2 TB only and with a metal case this drive comes formatted on NTFS for windows.
Both devices has the same connection USB 3.0 and USB 2.0
Both devices are being manufacturer with the same quality that represents WD products.
