Western Digital Ultrastar DC HC555 internal hard drive 18 TB 7200 RPM 512 MB 3.5" SAS3

24/7 operation: Yes Start/stop cycles: 600000 Mean time between failures (MTBF): 2500000 h Interface: SAS3 Average latency: 4.16 ms HDD capacity: 18 TB Storage drive buffer size: 512 MB Type: HDD HDD speed: 7200 RPM HDD sustained transfer rate: 257 MiB/s HDD size: 3.5" HDD average transfer rate: 269 MB/s Hot-swap: No HDD interface transfer rate: 12 Gbit/s Component for: Server/workstation Operating voltage: 5 / 12 V Power consumption (idle): 5.4 W Power consumption (typical): 8.8 W Storage temperature (T-T): -40 - 70 °C Operating vibration: 0.67 G Non-operating shock: 250 G Operating temperature (T-T): 5 - 60 °C Operating shock: 50 G Non-operating vibration: 1.04 G Height: 26.1 mm Depth: 147 mm Width: 101.6 mm Weight: 679 g Warranty period: 5 year(s) Warnings: Store away from water and moisture.