WD Red Plus NAS 4TB Hard Drive (WD40EFPX) specifications and procurement support from Kewentech.
| Model | WD40EFPX |
| Capacity | 4TB |
| Interface | SATA 6Gb/s |
| Form Factor | 3.5-inch |
| Cache | 256MB |
| Speed | 5400 RPM（实际主轴 7200 RPM，兼容旧系统报告） |
| Internal Transfer Rate | Up to 180 MB/s |
| Recording Technology | CMR（conventional magnetic recording） |
| 硬盘设计 | 空气填充 |
| Workload Rate | 180 TB/年 |
| MTBF | 1,000,000 小时 |
| Load / Unload Cycles | 600,000 |
| Non-recoverable Read Errors | <1 in 10^14 |
| Supported Drive Bays | 1–8 bays NAS |
| Native Command Queuing | Supported（NCQ） |
| Advanced Format | Supported（AF） |
| RoHS | Compliant |
| Warranty | 3 years |