14 TBytes Western Digital™ Purple HDD. Size: 3.5'' (Width: 102mm x Height: 26mm x Depth / length: 147mm). 512 MB cache. 5,400 rpm. Read: 255 MB/s. SATA/600 interface. Power: 15-pin connector. Continuous operation 24/7 (MTBF: 1,500,000 hours).