WD30EFAX vs WD30EFZX
WD WD30EFAX (3TB) versus WD WD30EFZX (3TB)
Verdict
For a NAS or any RAID array, the WD30EFZX is the clear pick - it's a CMR drive, while the WD30EFAX uses SMR recording, which is not recommended for RAID. Only consider the WD30EFAX for single-drive or archival use.
| WD30EFAX | WD30EFZX | |
|---|---|---|
| Capacity | 3 TB | 3 TB |
| Recording tech | SMR | CMR |
| RAID / NAS safe | No | Yes |
| Class | NAS | NAS |
| Spindle speed | 5400 RPM | 5400 RPM |
| Cache | 256 MB | 128 MB |
| Noise (idle) | 23 dB | 24 dB |
| Fill | Air | Air |
| Interface | SATA | SATA |
| Failure rate (AFR) | - | - |
| Price / TB | $55.80 | $68.76 |
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.