Western Digital (HGST) Ultrastar DC HC320 7K8 3.5in 8TB 256MB SAS 512E SE

General Model # / Part # See P/N Selector Tab See P/N Selector Tab Interface SATA 6Gb/s SAS 12Gb/s Capacity (GB) 6TB / 4TB 6TB / 4TB Sector Size (Variable, Bytes/sector) 4Kn: 4096 4Kn: 4096, 4104, 4160, 4224 512n*/512e: 512 512n*/512e: 512, 520, 528 Max Areal Density (Gbits/sq. in.) 512e/4Kn: 782, 696 (4TB) 512e/4Kn: 782, 696 (4TB) 512n*: 753 512n*: 753 Form Factor 3.5-inch 3.5-inch Performance Data Buffer (MB) 256 256 Rotational Speed (RPM) 7200 7200 Latency Average (ms) 4.16 4.16 Interface Transfer Rate (MB/sec, max) 600 1200 Sustained Transfer Rate 512e/4Kn: Up to 255MB/s; Up to 243MiB/s 512e/4Kn: Up to 255MB/s; Up to 243MiB/s 512n*: 233MB/s; 222MiB/s 512n*: 233MB/s; 222MiB/s Seek Time (read, ms, typical) 8.0 (read) / 8.6 (write) 8.0 (read) / 8.6 (write) Reliability Error Rate (non-recoverable, bits read) 1 in 10 15 1 in 10 15 MTBF (M hours) 2M hours 2M hours Annual Failure Rate (AFR) 0.44% 0.44% Load/Unload Cycles 600,000 600,000 Availability (hrs/day x days/wk) 24x7 24x7 Limited Warranty (yrs) 5 5 Acoustics Idle (Bels) 2.9 2.9 Operational (Bels, typical) 3.6 3.6 Power Requirement +5V, +12V +5V, +12V Operating (W, typical) 7.0 12.1 Idle (W) 5.9 7.0 Physical Size Z-Height (mm) 26.1 (max) 26.1 (max) Dimensions (width x depth, mm) 101.6 (+/-0.25) x 147 101.6 (+/-0.25) x 147 Weight (g, max) 715 715 Environmental (operating) Ambient Temperature 5°C to 60°C 5°C to 60°C Shock (half-sine wave) 70G (2 ms) 70G (2 ms) Vibration 0.67G RMS (XYZ, 5 to 500Hz) 0.67G RMS (XYZ, 5 to 500Hz) Environmental (non-operating) Ambient Temperature -40°C to 70°C -40°C to 70°C Shock (half-sine wave) 300G (2 ms) 300G (2 ms) Vibration 1.04G RMS (XYZ, 2 to 200Hz) 1.04G RMS (XYZ, 2 to 200Hz)