Technical reference
Western Digital WD Red Plus WD20EFPX 2TB specifications
One 2 TB WD20EFPX 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 | WD20EFPX[1] |
|---|---|
| Marketed capacity | 2 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 | WD20EFZX is a related 2TB column in the older brief, not this SKU[1] |
Performance
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 | 1.2 A[1] 12VDC ±5%; allow for simultaneous drive startup. |
|---|---|
| Average read/write power | 4 W[1] Room/ambient-temperature measurement; not maximum PSU demand. |
| Average idle power | 2.4 W[1] Room/ambient-temperature measurement. |
| Standby / sleep power | 0.3 W[1] Room/ambient-temperature measurement. |
| Idle acoustics | 21 dBA[1] Manufacturer rating; not room noise at your listening position. |
| Average seek acoustics | 26 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 | 300 g, 2 ms[1] |
| Maximum height / length | 26.1 /147 mm[1] |
| Width | 101.6 mm ±0.254 mm[1] |
| Weight | 450 g ±10%[1] |
Exact product identity & open questions
- Exact-model independent tests: Exact-MPN searches did not yield a method-disclosed original test.
- Exact NAS compatibility: No enclosure list was confirmed for WD20EFPX.
- Adorama / MemoryC / Best Buy live PDP: Adorama returned 403; B&H was not re-fetched (historical 199.99 on 2026-09-08).
- RV sensors and sector size: Not separately specified in the exact-model table.
- Exact-MPN original video: No WD20EFPX lab video was obtained.
Sources
Research updated Sep 11, 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 WD20EFPX; footnotes 1–10
- [2] Newegg WD20EFPX 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 WD20EFPX product listing ↗
Checked Sep 8, 2026 · MFR WD20EFPX-SPC4TN0; exact base MPN, 2 TB and quantity 1; In Stock and Add to Cart.
- [4] Western Digital WD20EFPX 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.
Research and review record
- Research: Grok 4.6 · Source research and data update
- Self-check: Grok 4.6 · Researcher self-check
- Independent review: GPT-6 (Codex) · Exact official MPN specifications, power/acoustic/environment columns and footnotes; original test evidence and applicability; primary merchant states and dated retained offers. Partial coverage and original-image/video gaps remain explicit.
- Editorial integration: GPT-6 (Codex) · Editorial integration and validation
Independent review completed for the scope recorded in the audit.
Source evidence and review history (JSON)