WD Ultrastar DC HC550 18TB, WUH721818ALE6L4

SATA  SAS  General    

Interface

SATA 6 Gb/s  SAS 12 Gb/s  Capacity1 18TB / 16TB  18TB / 16TB

•  Format: Sector size (bytes)2
• 4Kn: 4096
•  4Kn: 4096, 4112

  512e: 512 4160, 4224     512e: 512, 520, 528        Performance    

Data buffer (MB)3 512  512  Rotational speed (RPM) 7200  7200  Sustained transfer rate     (MiB/s, typical) 257/250  257/250 (MB/s, typical)4 269/262 269/262        Reliability    

Error rate (non-recoverable bits read) 1 in 1015 1 in 1015  MTBF (M hours, projected)5 2,5 2,5  Annualized Failure Rate (AFR, projected) 0.35%  0.35%  Load/Unload cycles (at 40°C) 600  600  Availability (hrs/day x days/wk) 24x7  24x7  Limited Warranty (yrs) 5  5        Acoustics    

Idle/Operating (Bels, typical) 2.0/3.6  2.0/3.6        Power    

Requirement +5 VDC, +12VDC  +5 VDC, +12VDC  Operating (W)6 6,5 8,8  Idle (W)7 5,6 5,8  Power consumption efficiency at Idle 0.31/0.35  0.32/0.36 (Watts/TB)             Physical Size     z-height (mm) 26.1  26.1  Dimensions (width x depth, mm) 101.6 (+/-0.25) x 147  101.6 (+/-0.25) x 147  Weight (g, max) 690  690         Environmental (Operating)    

Ambient temperature 5°C to 60°C  5°C to 60°C  Shock (half-sine wave, 2ms, G) 70  70  Vibration-Operating (G RMS, 5 to 500 Hz) 0.67 (XYZ)            Environmental (Non-Operating)    

Ambient temperature -40°C to 70°C  -40°C to 70°C  Shock (half-sine wave, G) 250 (2ms)/ 150 (11ms)  250 (2ms)/ 150 (11ms)  Random Vibration (G RMS, 2 to 200 Hz) 1.04 (XYZ)  1.04 (XYZ)

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