WD4005FFBX vs WD40EFAX
NAS drive head-to-head - specs, value and live price side by side.
Verdict
For a NAS or any RAID array, the WD4005FFBX 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
WD4005FFBX
$53.73
WD40EFAX
$55.35
Capacity
WD4005FFBX
4 TB
WD40EFAX
4 TB
Noise (idle)
WD4005FFBX
20 dB
WD40EFAX
23 dB
Price history · CA, cheapest per day
WD4005FFBX C$350
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| WD4005FFBX | WD40EFAX | |
|---|---|---|
| Capacity | 4 TB | 4 TB |
| Recording tech | CMR | SMR |
| RAID / NAS safe | Yes | No |
| Class | NAS-Pro | NAS |
| Spindle speed | 7200 RPM | 5400 RPM |
| Cache | 256 MB | 256 MB |
| Noise (idle) | 20 dB | 23 dB |
| Fill | Air | Air |
| Interface | SATA | SATA |
| Failure rate (AFR) | - | - |
| Price / TB | $53.73 | $55.35 |
| Buy |
C$350
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No CA price yet |
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.
WD4005FFBX
No Backblaze failure data for this model.
5yr warranty · 300 TB/yr rated · 1,000,000h MTBF
WD40EFAX
No Backblaze failure data for this model.
3yr warranty · 180 TB/yr rated · 1,000,000h MTBF