WD40EFAX vs WD40EFPX
NAS drive head-to-head - specs, value and live price side by side.
Verdict
For a NAS or any RAID array, the WD40EFPX is the pick - it's CMR. The WD40EFAX uses SMR recording, which is not recommended for RAID (single-drive or archival use only).
Value at a glance
Price / TB
WD40EFAX
$59.13
WD40EFPX
$61.62
Capacity
WD40EFAX
4 TB
WD40EFPX
4 TB
Noise (idle)
WD40EFAX
23 dB
WD40EFPX
24 dB
Price history
UK · cheapest per day
WD40EFPX £195
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| WD40EFAX | WD40EFPX | |
|---|---|---|
| Capacity | 4 TB | 4 TB |
| Recording tech | SMR | CMR |
| RAID / NAS safe | No | Yes |
| Class | NAS | NAS |
| Spindle speed | 5400 RPM | 5400 RPM |
| Cache | 256 MB | 256 MB |
| Noise (idle) | 23 dB | 24 dB |
| Fill | Air | Air |
| Interface | SATA | SATA |
| Failure rate (AFR) | - | - |
| Price / TB | $59.13 | $61.62 |
| Buy | No UK price yet |
£195
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Highlighted cells mark the stronger spec for a NAS build. Failure rates from Backblaze Drive Stats where available; $/TB uses the cheapest live price. Buy links are Amazon affiliate.
WD40EFAX
No Backblaze failure data for this model.
3yr warranty · 180 TB/yr rated · 1,000,000h MTBF
WD40EFPX
No Backblaze failure data for this model.
3yr warranty · 180 TB/yr rated · 1,000,000h MTBF