SATA 6Gb/s, 7200RPM, 512MB Buffer, Internal 3.5″ NAS Hard Drive.

WD Red Plus 10TB SATA 3.5" Intellipower 256MB NAS HDD 3Yr Wty.
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WD Ultrastar 2TB DC HA210 SATA 3.5" 7200RPM 128MB NAS HDD
$224.00
WD Red Pro 14TB SATA 3.5″ 7200RPM 512MB NAS HDD 5Yr Wty
SATA 6Gb/s, 7200RPM, 512MB Buffer, Internal 3.5″ NAS Hard Drive.
