Technical reference
Western Digital WD Red Plus WD40EFZZ 4TB specifications
One 4 TB WD40EFZZ drive ·3.5-inch SATA ·CMR ·5400 RPM
Complete specifications with requirements, upgrade limits and sources. For our buying judgment, reviews and prices, return to the buying guide.
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Search all 36 specifications, including conditions and limits.
Identity
Exact-model ratings and their applicable conditions.
| Exact model | WD40EFZZ[1] |
|---|---|
| Marketed capacity | 4 TB[1] Decimal capacity; formatting, filesystem and redundancy reduce usable space. |
| Form factor | 3.5-inch[1] |
| Interface | SATA 6 Gb/s[1] |
| Recording technology | CMR[1] |
| Drive atmosphere | Air[1] |
| Advanced Format | Yes[1] The table confirms AF; it does not separately specify the logical sector size. |
| Native command queuing | Yes[1] |
| RoHS compliant | Yes[1] EU 2011/65/EU and 2015/863. |
| Same-capacity related MPN | WD40EFPX is a 256 MB / 4.7 W / 23 dBA 4TB Red Plus column, not this SKU[1] |
Performance
Exact-model ratings and their applicable conditions.
| Spindle speed | 5400 RPM[1] |
|---|---|
| Cache | 128 MB[1] 128 MB on WD40EFZZ; do not use WD40EFPX 256 MB figures. |
| Maximum internal transfer rate | 180 MB/s[1] Manufacturer internal testing; host, capacity and workload affect results. Not a network-copy result. |
NAS and reliability
Exact-model ratings and their applicable conditions.
| NAS bay rating | Up to 8[1] Rating does not establish exact enclosure/firmware compatibility. |
|---|---|
| Operation | 24 × 7[1] |
| NASware | NAS-optimized drive parameters[1] |
| Dual-plane balance control | Yes[1] |
| Annual workload rate | 180 TB/year[1] Annualized transferred data: TB transferred ×8760 / recorded power-on hours; not lifetime TBW. |
| MTBF rating | 1 million hours[1] Population estimate at90TB/year and40°C drive temperature; derates above these parameters up to65°C. Not an individual-drive lifespan or warranty. |
| Load/unload cycles | 600, 000[1] Controlled unload at ambient conditions. |
| Nonrecoverable read errors | <1 in 10^14 bits read[1] |
| Limited warranty | 3 years[1] Region-specific conditions apply; confirm seller and serial number coverage. |
Power and acoustics
Exact-model ratings and their applicable conditions.
| Peak 12V current | 1.75 A[1] 12VDC ±5%; allow for simultaneous drive startup. |
|---|---|
| Average read/write power | 4.5 W[1] Room/ambient-temperature measurement; not maximum PSU demand. |
| Average idle power | 2.9 W[1] Room/ambient-temperature measurement. |
| Standby / sleep power | 0.3 W[1] Room/ambient-temperature measurement. |
| Idle acoustics | 24 dBA[1] Manufacturer rating; not room noise at your listening position. |
| Average seek acoustics | 27 dBA[1] Enclosure vibration and placement affect perceived noise. |
Environment and dimensions
Exact-model ratings and their applicable conditions.
| Operating temperature | 0 °C to 65 °C[1] |
|---|---|
| Non-operating temperature | −40 °C to 70 °C[1] |
| Operating shock, read/write | 70 g, 2 ms[1] |
| Operating shock, read | 70 g, 2 ms[1] |
| Non-operating shock | 250 g, 2 ms[1] |
| Maximum height / length | 26.1 /147 mm[1] |
| Width | 101.6 mm ±0.254 mm[1] |
| Weight | 550 g ±10%[1] |
Exact product identity & open questions
- Exact-model independent tests: Still no WD40EFZZ lab. TechRadar and NASCompares 4TB coverage identify WD40EFPX. Firebls 2021 coverage identifies WD40EFZX. Syobon DXP2800 4TB RAID1 photos are WD40EFPX-68C6CN0. PCLINE self-asserts testing without outputs. ArigatoNAS estimates from specs; its 2.5GbE test used WD Blue 4TB.
- Exact NAS compatibility: Synology compatibility URLs returned JavaScript shells with no extractable table this round. Search summaries name WD40EFPX/WD40EFZX for some DiskStations, not WD40EFZZ. QNAP EU store merchandises WD40EFZZ; that is not a US HCL extract.
- RV sensors and sector size: Not separately specified in the exact-model table. Marketing pages mention RV sensors for the Red family; the Plus table has no RV column.
- B&H / Best Buy live PDP: B&H $239.99 remains 2026-09-08. Best Buy JXTHCC7V3X was not successfully fetched. CDW $212.99 captured 2026-09-12. Target Spacebound listing had no visible USD.
- Exact-MPN original video: YouTube results for WD40EFZZ did not yield an exact-MPN benchmark. C7faCi__zLI is WD40EFPX-68C6CN0 spin-up/spin-down sound. DXM7znUSIPg remains WD40EFPX. ASR/frames were not obtained.
Sources
Research updated Sep 12, 2026. Individual source check dates are listed below. Measurements belong to the named reviewers; tested configurations and software versions may differ from the product you buy.
- [1] WD Red Plus HDD data sheet (September 2025) ↗
Checked Sep 11, 2026 · September 2025 p.2 column WD40EFZZ; footnotes 1–10
- [2] Newegg WD40EFZZ product listing ↗
Checked Sep 8, 2026 · Primary offer sold and shipped by Newegg; Add to cart; limit 2 per customer; new standard listing.
- [3] B&H WD40EFZZ product listing ↗
Checked Sep 8, 2026 · MFR WD40EFZZ-SPCPAN0; exact base MPN, 4 TB and quantity 1; In Stock and Add to Cart.
- [4] Western Digital WD40EFZZ product listing ↗
Checked Sep 8, 2026 · Exact SKU title/model confirmed; price and inventory appear as unresolved template fields. No stock inference from hidden buttons.
- [5] Newegg: WD40EFZZ current US new listing ↗
Checked Sep 10, 2026 · Exact MPN in H1; selected main offer shows Add to cart, seller Newegg, and a visible price of $194.99.
- [7] CDW WD Red Plus 4 TB WD40EFZZ ↗
Checked Sep 12, 2026 · Mfg # WD40EFZZ; $212.99; Add To Cart; 128 MB buffer; 5400 rpm; 4 TB; 3.5-inch SATA 6 Gb/s
Research and review record
- Research: Grok 4.6 · Targeted additional original-source research for five mainstream HDDs.
- Self-check: Grok 4.6 · Source identity, method and data self-check; WD original session also verified the parent-supplied Zigsow lead.
- Independent review: GPT-6 (Codex) · Original evidence verification, applicability decisions and correction of incomplete case follow-up and document interpretation.
- Editorial integration: GPT-6 (Codex) · Preserve source history, update five local research records and existing coverage report.
Independent review completed for the scope recorded in the audit.
Source evidence and review history (JSON)