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Product Code: UDHO-4172
MPN #: WD40EFZZ
Product Condition: New
Running out of reliable storage for your NAS can cause downtime and data loss, leaving your business vulnerable. The Western Digital Red Plus WD40EFZZ 4TB 5400RPM 128MB 3.5" SATA Hard Drive is a purpose-built Hard Drive that delivers steady performance and 24 × 7 reliability for small-to-medium NAS environments, keeping your files safe and accessible.
With this Hard Drive you experience quiet, low-power operation that never compromises on capacity. It fits seamlessly into most 3.5" bays and works smoothly with RAID-optimised systems, so you can focus on growing your data without worrying about compatibility or overheating.
This Hard Drive is ideal for small-to-medium businesses, home offices, and power users who need a dependable, energy-efficient storage solution for multi-bay NAS systems, media servers, or backup arrays.
| Miscellaneous | |
| Miscellaneous / MTBF | 1,000,000hours |
| Storage | |
| Storage / Type | Hard drive |
| Header | |
| Header / Product Line | WD Red Plus |
| Header / Packaged Quantity | 1 |
| Dimensions & Weight | |
| Dimensions & Weight / Height | 1in |
| Dimensions & Weight / Width | 4in |
| Dimensions & Weight / Depth | 5.8in |
| Dimensions & Weight / Weight | 19.4oz |
| Environmental Parameters | |
| Environmental Parameters / Min Operating Temperature | 32 °F |
| Environmental Parameters / Max Operating Temperature | 149 °F |
| Environmental Parameters / Min Storage Temperature | -40 °F |
| Environmental Parameters / Max Storage Temperature | 158 °F |
| Environmental Parameters / Shock Tolerance (non-operating) | 250 g @ 2 ms |
| Environmental Parameters / Shock Tolerance (operating) | 70 g @ 2 ms |
| Environmental Parameters / Sound Emission | 27 dBA |
| General | |
| General / Capacity | 4 TB |
| General / Depth | 5.8 in |
| General / Buffer Size | 128 MB |
| General / Width | 4 in |
| General / Weight | 19.4 oz |
| General / Interface | SATA 6Gb/s |
| General / Device Type | Hard drive - internal |
| General / Form Factor | 3.5" |
| General / Features | Conventional magnetic recording (CMR), Air Drive Design, Advanced Format technology, NAS compatible, NASware technology |
| General / Height | 1 in |
| Expansion & Connectivity | |
| Expansion & Connectivity / Interfaces | 1 x SATA 6 Gb/s |
| Expansion & Connectivity / Compatible Bay | 3.5" |
| Performance | |
| Performance / Drive Transfer Rate | 600 MBps (external) |
| Performance / Spindle Speed | 5400 rpm |
| Performance / Internal Data Rate | 180 MBps |
| Reliability | |
| Reliability / 24x7 Operation | Yes |
| Reliability / MTBF | 1,000,000 hours |
| Reliability / Non-Recoverable Errors | 1 per 10^14 |
| Reliability / Load / Unload Cycles | 600,000 |
| Hard Drive | |
| Hard Drive / Internal Data Rate | 180MBps |
| Hard Drive / Form Factor | 3.5" |
| Hard Drive / Non-Recoverable Errors | 1 per 10^14 |
| Hard Drive / Spindle Speed | 5400rpm |
| Hard Drive / Interface | Serial ATA-600 |
| Hard Drive / Form Factor (Short) | 3.5" |
| Hard Drive / 24x7 Operation | Yes |
| Hard Drive / Form Factor (Short) (metric) | 8.9 cm |
| Hard Drive / Capacity | 4TB |
| Hard Drive / Data Transfer Rate | 600MBps |
| Hard Drive / Buffer Size | 128MB |
| Hard Drive / Hard Drive Type | Internal hard drive |
| Hard Drive / Form Factor (metric) | 8.9 cm |
| Power | |
| Power / Power Consumption | 4.5 watt (read) ¦ 4.5 watt (write) ¦ 2.9 watt (idle) ¦ 0.3 watt (sleep) |
| Summary Details | |
| HDD capacity | 4 TB |
| HDD speed | 5400 RPM |
| Storage drive buffer size | 128 MB |
| HDD size | 3.5" |
| Interface | Serial ATA III |
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We are retiring PICOPC Products MNHO-073, MNHO-048 and MNHO-043 and they have reached EOL (End Of Life) as we are introducing new products with better technology. We would recommend you to look into MNHO-095. For Untangle, pfSense, OPNsense, Windows 11, Proxmox VE etc. we recommend MNHO-095 whereas for Sophos, Kerio Control and Endian, we would recommend MNHO-069. (A complete list of supported OS can be found in each product's listing)