WD Red Plus NAS 4TB Hard Drive (WD40EFZZ) specifications and procurement support from Kewentech.
| Model | WD40EFZZ |
| Capacity | 4TB |
| Interface | SATA 6Gb/s |
| Cache | 128MB |
| Speed | 5400 RPM |
| Recording Technology | CMR |
| Maximum Transfer Rate | 175 MB/s |
| Form Factor | 3.5-inch |
| Operating Temperature | 0°C - 65°C |
| Type | NAS hard drive |
| Supported Drive Bays | 1–8 bays |