WD40EFAX
WD Red · 4TB
SMR
✗ SMR - avoid for RAID / NAS
€219
(€54.75/TB)
Best price at Amazon · NL
Last checked Jul 6, 2026 · Price and availability subject to change.
Specifications
- Capacity
- 4 TB
- Technology
- SMR
- Class
- NAS
- RPM
- 5400
- Cache
- 256 MB
- Noise (idle / seek)
- 23 / 29 dB
- Fill
- Air
- Interface
- SATA
- Form factor
- 3.5"
- Data confidence
- Low
Reliability
No large-scale failure-rate data - Backblaze tracks mostly datacenter-class drives, so consumer/SMR models rarely appear. Reliability rankings →
Warranty3 years
Rated workload180 TB/yr
MTBF1,000,000 hrs
Entry NAS line; older 2-6TB units use SMR, so verify before RAID use.
Manufacturer-rated specs (Manufacturer spec), not observed failure data.
Price history
NL · cheapest per day
€219 latest