With a 7200 RPM spin speed, 16 MB cache, and capacities up to 320 GB, the Western Digital Scorpio Black series of 2.5″ notebook hard drives should send fear down the heads and to the platters of competing hard drives. Read on to see how the WD Scorpio Black 320GB hard drive (WD3200BJKT) does against six other 2.5″ drives!