Its a very small, very large hard drive,
Verified Purchase(What is this?)
This review is from: WD My Passport 1TB Portable Hard Drive - Black (Personal Computers)
Big capacity, small HDD. Lots of people whinge about how these fail too often, I have not (yet, don't tempt fate) had that experience. Although I do share peoples fears about the USB connections being a bit fragile.
Overall though, 10 years ago a 250GB drive would have cost you 5 times as much, been 2 or three times as large and required an external power source (with associated transformer), not exactly pocket friendly. So compared to that, this is pretty decent product.