I think this is the cheapest at the moment.
* Reduced power consumption - WD has reduced power consumption by up to 40 percent compared to competitors' drives with the combination of WD's IntelliSeek, IntelliPark, and IntelliPower technologies
* Helps enable eco-friendly PCs - WD Caviar Green drives yield an average drive power savings of 4-5 watts over competitors' drives making it possible for our energy-conscious customers to build systems with higher capacities and the right balance of system performance, ensured reliability, and energy conservation
* Cool and Quiet - GreenPower technology yields lower operating temperatures for increased reliability and low acoustics for ultra-quiet PCs and external drives.
* IntelliPower - A fine-tuned balance of spin speed, transfer rate and caching algorithms designed to deliver both significant power savings and solid performance. Additionally, WD Caviar Green drives consume less current during startup allowing lower peak loads on systems as they are booted
* IntelliSeek - Calculates optimum seek speeds to lower power consumption, noise and vibration
* IntelliPark - Delivers lower power consumption by automatically unloading the heads during idle to reduce aerodynamic drag
* Perpendicular Magnetic Recording (PMR) - Employs PMR technology to achieve even greater areal density
* StableTrac - The motor shaft is secured at both ends to reduce system-induced vibration and stabilize platters for accurate tracking, during read and write operations. (750 GB and 1 TB only)
* Product Dimensions: 50 x 50 x 50 cm ; 731 g
* Boxed-product Weight: 908 g
* Delivery Restrictions: This item can only be delivered within the UK
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* Item model number: WD10EACS
* ASIN: B000X4PJG8
* Date first available at Amazon.co.uk: 29 May 2008