its NOT the same as a notebook drive
"The VelociRaptor takes advantage of the latest advances in areal density by shrinking the platters even further, to 2.5in such that the new drive has the same 99 x 69 x 15mm dimensions as a notebook hard drive. There’s no expectation that anyone will use VelociRaptor inside a laptop as the smaller form-factor is aimed at Enterprise customers who want to stuff their blades with storage."
The other reason no one will stuff them into notebooks is that notebooks use 9.5 mm and 12.5mm high drives, I have never seen a notebook which could take a 15mm drive (let alone deal with the eat or power issues of this one). So it is NOT the "same dimensions as a notebook hard drive".