I just openened my 1.5TB Iomega® Prestige™ SuperSpeed USB 3.0 Portable Hard Drive to check out what is inside, and if the HDD would fit in my ThinkPad W701.
The answer to the latter is no: the drive is almost 15mm high, and the Serial UltraBay Enhanced bay only fits 12.5 mm drives.
The drive inside is a Seagate 1.5TB FreePlay ST1500LM003 drive.
Funny (by the way: be very cautious when a programmer says that), as the Seagate site has absolutely no reference of FreePlay drives.
The only link with tech specs I could find was on the MacSales site from OWC (the same store that got me a Mac Mini Server memory upgrade).
It looks like it is a OEM product containing 4 platters, and therefore is 14.8mm high.
It makes of a great HDD for a home theatre PC though: silent, low power, etc.
–jeroen