HGST MegaScale HMS5C4040BLE641 4TB 3.5" 5700 RPM SATA III 6.0GB/s HDD Hard Disk Drive 0F22149.Model Number: HMS5C4040BLE641HGST Part Number: 0F22149Specifications:- Form Factor: 3.5"- Capacity: 4TB- Buffer Cache: 64MB- RPM: 5700- Average Rotational Latency: 5.26 ms- Drive Interface Type: SATA III, Serial ATA-600 (6.0 Gbs)