Western Digital Red 6000GB Serial ATA III

6TB, SATA 6 Gb/s, 8.89 cm (3.5 ") , IntelliPower, 64MB Cache WD Red is designed specifically for NAS systems that have 1 to 8 drive bays in both 3.5-inch and 2.5-inch form factors. The drives are designed and extensively tested for compatibility in the unique 24x7
operating environment and for the demanding system requirements of home and small office NAS.