Velociraptors typically aren't usable as 2.5" drives...
They're 2.5" drives in a HUGE heatsink, making them take up a 3.5" bay. I would not take it out of the heatsink and install it in a PS3.
EDIT: Apparently there are now 2.5" versions. Even so, they will not work in your PS3 due to being 15mm high, and I believe the PS3 only takes 9mm high drives.
60GB (120GB WD Scorpio Drive) PS3 (CECHA01, NTSC), 3.7OFW
60GB (640GB Samsung Drive) PS3 (CECHC04, PAL), Kmeaw 3.55, Repaired (Dead Laser)
PSP-1003 FAT, CFW5.00 M33-6 & Prometheus v2
X-Box 360 Xenon (JTAG'ed, 500GB HDD)