http://www.wdc.com/wdproducts/library/Flyer/ENG/2178-701024.pdf
WD Caviar® Blue™
With SATA and PATA interfaces, and cache sizes ranging from 2 MB to 16 MB, these drives offer a full range of performance features.
WD Caviar Green™
These drives make it possible for energyconscious customers to build systems with
higher capacitiesand the right balance of system performance,ensured reliability, and energy conservation.
WD Caviar Black™
These high-performance SATA drives combine 7200 RPM spin speed, up to 64 MB cache, SATA 3 Gb/s interface, and an integrated dual processor for lightning-fast performance in demanding desktop, workstation, and multi-drive systems.
WD Scorpio® Blue™
With available SATA or PATA interfaces, these drives offer high-performance, low power consumption, and cool operation, perfect for notebooks and other portable devices.
WD Scorpio Black™
Designed for top-of-the-line notebook computers, these high-performance drives
deliver the capacity and speed needed to supercharge a notebook PC without
compromising battery life or quiet acoustics.