The Western Digital Caviar Green 2TB WD20EADS hard drive boosts the capacity game to a whole new level. This £209 disk crams 2 terabytes into a single drive - making it a boon to anyone with a large data archive, multimedia library, or space-hogging video collection.

We've used words like gargantuan and massive before to describe the capacity of a hard-disk drive, but this model blows all other examples away. With the WD20EADS Western Digital is the first drive maker to achieve 2TB in one drive. The previous top honours for capacity went to the Seagate Barracuda 7200.11 1.5TB drive.

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This capacious internal drive provides an areal density of 400 gigabits per square inch on four 500GB platters. The WD20EADS drive is also part of WD's Green Power line of hard disk drives, billed as environmentally friendly drives due to their lower power consumption.

In our benchmarks, the 2TB WD20EADS' performance was above average and bettered that of its sibling, the Caviar Green 1TB WD10EACS.

The WD20EADS lagged behind our performance leaders (the Western Digital RE3 Enterprise 500GB and the WD VelociRaptor) on some results - most notably, the write-intensive disk imaging test that we perform as part of PC WorldBench 6.

On other core metrics, though, the 2TB WD20EADS drive performed very competitively. For example, it completed our "write files and folders" test in 112 seconds and our "write large files" test in 92 seconds. On each of those tests, its results were off those of our performance leaders by a dozen seconds or less.

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The 2TB WD20EADS drive has several WD technologies inside that the company says enable this model to achieve its balance of price and performance. StableTrac reduces vibration by securing the motor shaft at both ends, and this in turn permits accurate head tracking during read and write operations.

IntelliPower, according to WD, adjusts the balance of spin speed, transfer rate, and caching algorithms for optimal balance between performance and power consumption. IntelliSeek optimises seek speeds to enable lower power consumption, noise, and vibration. And WD's NoTouch ramp-load technology keeps the recording head from touching the disk media.

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