| Model Number | WD181KRYZ | 
| Form Factor | 3.5-inch | 
| Interface | SATA 6 Gb/s | 
| 512n / 512e user sectors per drive | 512e | 
| Formatted Capacity | 18TB | 
| RoHS compliant | Yes | 
| Performance | |
| Data Transfer Rate (max sustained) | 269MB/s | 
| Performance Class | 7200 RPM Class | 
| Cache | 512MB | 
| Power Management | |
| Average power requirements (W) | |
| Operational | 6.5W | 
| Idle | 5.6W | 
| Power efficiency index (W/TB, idle) | 0,31 | 
| Reliability | |
| MTBF (hours) | 2 500 000 | 
| Annualized Failure Rate (AFR, %) | 0,35 | 
| Limited Warranty | 5 years | 
| Environmental | |
| Operating Temperature | 5° C to 60° C | 
| Non-Operating Temperature | -40°C to 70°C | 
| Shock (Read/Write) Operating (half-sine wave, 2ms) | 50G/50G | 
| Non-operating (half-sine wave, 2ms) | 250G | 
| Acoustics (average) Idle Mode | 20 dBA | 
| Seek Mode | 36 dBA | 
| Physical Dimensions | |
| Height (max) | 26.1 mm | 
| Length (max) | 147.0 mm | 
| Width (± .01 in.) | 101.6 mm | 
| Weight | 1.52 lb (.69 kg) +/- 10% | 
