Western Digital released a hard drive aimed directly at home NAS users. It should also work great for home file servers, and any server where a 5400 RPM SATA drive is appropriate.
WD has several features that they’re touting as critical for the NAS user including; NASware specialized firmware, Intellipower low power spindle, robust NAS compatibility list, three year warranty and a dedicated WD Red 24×7 customer support line (1-855-55-WDRED if you need them).