Given that not all computers can handle 2.5TB and 3TB hard drives, WD is including an Advanced Host Controller Interface (AHCI)-compliant Host Bus Adapter (HBA) to give the operating system a known driver with support for large capacity drives.
The Caviar Green HDD series also gets its unique name from two sources. First, WD insists that the Caviar Green model is an "eco-friendly storage solution" as it incorporates WD GreenPower Technology for reducing power consumption by enabling lower operating temperatures. This increases reliability while decreasing noise. Win, win. The Caviar Green drives can also be repurposed as external storage solutions.
Backed by a 3-year warranty, the WD Caviar Green 2.5TB and 3TB hard drives are available now in the U.S. for $189.00 USD and $239.00 respectively.