WD 18GB Ultrastar DC HC550 WUH721818AL5204 Enterprise 3.5″ SAS 12Gb/s 7200rpm 512MB Cache HDD
| Main Specifications | ||
| Device Type | Hard drive – internal – 512e Format | |
| Capacity | 18TB | |
| Interface | SAS 12Gb/s | |
| Form Factor | 3.5-inch HDD | |
| Dimensions (WxDxH) | 101.6 (+/-0.25) x 147 mm | |
| Weight | 690 (g, max) | |
| Hard Drive | ||
| Buffer Size | 512MB | |
| Spindle Speed | 7200RPM | |
| Performance | ||
| Average Latency | 4.16 ms | |
| Max Sustainable Transfer Rate | 250 | |
| Load / Unload Cycles | 600,000 | |
| Interface Transfer Rate | 1200 (MB/sec, max) | |
| Reliability | ||
| Non-Recoverable Errors | 1 in 10^15 | |
| Availability (hrs/day x days/wk) | 24×7 | |
| Annual Failure Rate (AFR) | 0.35% | |
| Miscellaneous | ||
| MTBF | 2.5 (M hours) | |
| Key Application | Cloud & Hyperscale storage, Massive scale-out (MSO), high-density data centers, Distributed File Systems, Bulk storage using object storage solutions like, Ceph and OpenStack Swift, Primary and secondary storage for Apache, Hadoop for Big Data Analytics | |
| Features | 16TB capacity in a standard 3.5-inch form factor, CMR technology works with all capacity enterprise, applications & environments, Reliable, field-proven, 6th generation design, Industry’s first HDD with Energy-Assisted Magnetic Recording technology, Industry’s first Triple Stage Actuator, HelioSeal design delivers outstanding power efficiency, 2.5M hours (projected) MTBF² rating & 5-year limited warranty | |
| Power | ||
| Requirement | +5 VDC, +12VDC | |
| Idle (W) | 5.8 | |
| Environmental | ||
| Operating Environment | Ambient temperature: 5° to 60°C | |
| Shock (half-sine wave, 2ms, G): 50 | ||
| Vibration (G RMS, 5 to 500Hz): 0.67 (XYZ) | ||
