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New high areal density 2-and-3 TB Greens from WD | silentpcreview.com
... which addresses the 2.19 TB barrier imposed by legacy BIOS and the Master Boot Record (MBR) partition table scheme. This document is worth a read if you're looking for a more complete understanding of the 2.19 TB limitation. It's a complicated issue that we posted news on some weeks ago (Sandy Bridge, Bulldozer and UEFI); in a nutshell, the only consistent way to access more than 2.19 TB in a single drive with most current PCs is to use it as a secondary, non-boot, storage drive. Widespead adoption of 64-bit Windows and the new Unified Extensible Firmware Interface (UEFI)  replacing the motherboard BIOS  using Globally Unique Identifier (GUID) partitions will be required before >2.19 TB drives can be used routinely as boot drives
The new 750 and 667 GB/platter density Caviar Greens extend WD's lead in hard drive energy efficiency and low noise ...
We like the 3TB Green, but we love the new 2TB Green. The new 3-platter 2TB WD Green, model WD20EARS, is a sweet spot product at this tine. 2TB Greens are routinely selling for $100 or less these days, which is a bargain when you consider the performance and the fact that our two samples are the quietest hard drives we've tested, with extremely low vibration. It's better in this regard than just about any laptop drives of any size or speed, and its idle power is almost as low, dropping to just 2.4W when the heads are parked.
The storage scheme for a quiet desktop PC of a modest size (80~120 GB) high performance SSD for the OS and programs plus a high density WD Caviar Green for data is more compelling than ever.