WD40EFPX vs WD40EZAZ
WD WD40EFPX (4TB) versus WD WD40EZAZ (4TB)
Verdict
For a NAS or any RAID array, the WD40EFPX is the clear pick - it's a CMR drive, while the WD40EZAZ uses SMR recording, which is not recommended for RAID. Only consider the WD40EZAZ for single-drive or archival use.
| WD40EFPX | WD40EZAZ | |
|---|---|---|
| Capacity | 4 TB | 4 TB |
| Recording tech | CMR | SMR |
| RAID / NAS safe | Yes | No |
| Class | NAS | Desktop |
| Spindle speed | 5400 RPM | 5400 RPM |
| Cache | 256 MB | 256 MB |
| Noise (idle) | 24 dB | 23 dB |
| Fill | Air | Air |
| Interface | SATA | SATA |
| Failure rate (AFR) | - | - |
| Price / TB | $41.76 | $49.00 |
Highlighted cells mark the stronger spec for a NAS build. Failure rates from Backblaze Drive Stats where available; $/TB shows once live prices are wired.