The WD RE SAS and WD RE SATA nearline drive series are also available in capacities of 1 TB, 2 TB and 3 TB for SAS as well as 2 TB and 3 TB for SATA. The 4 TB drive integrates five 800 MB platters.
According to the manufacturer, the 7,200 RPM drives promise a reliability of 1.4 million hours MTBF for the SAS versions and 1.2 million hours MTBF for the SATA models. WD said that the drives also include the company's NoTouch ramp load technology, which reduces wear of the recording heads as the heads do not touch the disk media.
Pricing starts at $139 for the 1 TB SAS model, and goes as far as $479 for the 4 TB version. The SATA models are $20 cheaper than their SAS counterparts.