4TB 3.5-inch NAS hard drive
WD Red Plus 4TB WD40EFZZ 3.5-inch SATA NAS HDD
The WD Red Plus 4TB WD40EFZZ is a CMR hard drive designed for always-on RAID-optimised NAS systems with up to eight bays, combining 4TB capacity, 5400 RPM operation, NASware technology and a three-year limited warranty.
- Capacity
- 4TB
- Drive speed
- 5400 RPM
- Transfer rate
- Up to 180MB/s
- NAS positioning
- RAID-optimised systems up to 8 bays
Purpose-built storage for an always-on NAS
The WD Red Plus 4TB WD40EFZZ is designed for home offices, power users and small to medium businesses that need centralised storage, backup and file sharing. NASware tunes drive parameters for NAS workloads, while the 180TB/year workload rating and one-million-hour MTBF provide clear planning figures for continuous operation.
Designed for NAS
NASware technology tunes drive parameters for supported network attached storage workloads.
CMR recording
Conventional magnetic recording provides the exact recording technology specified for this model.
Always-on operation
The drive is designed for systems that operate continuously, supporting 24×7 access to stored data.
RAID-ready positioning
Western Digital specifies this model for RAID-optimised NAS systems with up to eight bays.
Balanced multi-drive use
Rotation-vibration sensing and balance control help the drive operate in multi-bay NAS environments.
Defined workload coverage
A 180TB/year workload rating and three-year limited warranty support informed deployment planning.
Who is the WD Red Plus 4TB WD40EFZZ best for?
A strong choice for
- Home and home-office NAS storage
- Power users building a private cloud
- Small-business file sharing
- Centralised computer backups
- NAS owners needing 4TB per drive
Consider another model if you need
- Your NAS compatibility list does not include this exact model
- You need more than eight bays under the stated compatibility positioning
- Your workload exceeds the supplied 180TB/year rating
- You require an SSD rather than a mechanical hard drive
Key specifications
- Model
- WD40EFZZ
- Capacity
- 4TB
- Form factor
- 3.5-inch
- Interface
- SATA
- Transfer rate
- Up to 180MB/s
- Drive speed
- 5400 RPM
- Recording technology
- CMR
- Cache
- 128MB
- Workload rating
- 180TB/year
- MTBF
- 1 million hours
- Dimensions (L × W × H)
- 5.787 × 4 × 1.028 inches
- Weight
- 550 g
- Warranty
- 3-year limited warranty
Full technical specifications
Capacity, interface and performance
| Model number | WD40EFZZ |
|---|---|
| Capacity | 4TB |
| Form factor | 3.5-inch |
| Connector | SATA |
| Interface | SATA |
| Transfer rate | Up to 180MB/s |
| Drive speed | 5400 RPM |
| Recording technology | CMR |
| Cache size | 128MB |
NAS workload and reliability
| NAS positioning | RAID-optimised NAS systems with up to 8 bays |
|---|---|
| Operating design | 24×7 continuous operation |
| Workload rating | 180TB/year |
| Mean time between failures | 1 million hours |
| NASware | Supported |
| Rotation-vibration sensing | Supported |
| Limited warranty | 3 years |
Physical and environmental
| Dimensions (L × W × H) | 5.787 × 4 × 1.028 inches |
|---|---|
| Weight | 550 g |
| Operating temperature | 0°C to 65°C |
| Non-operating temperature | -40°C to 70°C |
Frequently asked questions about the WD Red Plus 4TB WD40EFZZ
What is the WD Red Plus 4TB WD40EFZZ?
The WD Red Plus 4TB WD40EFZZ is a 4TB 3.5-inch SATA hard drive designed for RAID-optimised NAS systems with up to eight bays.
What recording technology does the WD40EFZZ use?
The WD40EFZZ uses conventional magnetic recording (CMR).
What speed does the WD40EFZZ run at?
The WD40EFZZ is specified at 5400 RPM.
What transfer rate does the WD40EFZZ provide?
Western Digital specifies a transfer rate of up to 180MB/s. Actual performance depends on the NAS, workload and configuration.
How much cache does the WD40EFZZ include?
The WD40EFZZ includes 128MB of cache.
Is the WD40EFZZ designed for continuous operation?
Yes. WD Red Plus drives are designed for NAS systems that operate 24×7.
What workload rating applies to the WD40EFZZ?
The verified workload rating is 180TB per year.
How many NAS bays is the WD40EFZZ positioned for?
Western Digital positions the WD40EFZZ for RAID-optimised NAS systems with up to eight bays.
What are the WD40EFZZ dimensions?
It measures 5.787 × 4 × 1.028 inches in length, width and height.
What warranty applies to the WD40EFZZ?
Western Digital specifies a three-year limited warranty.
- Check the exact NAS manufacturer compatibility list before purchase.
- Usable capacity depends on the NAS file system, RAID configuration and system-reserved space.
- The 180TB/year value is a workload rating, not an SSD-style lifetime TBW specification.
- Warranty service and terms are subject to Western Digital regional conditions.
