Nominal capacity
4 TB
Formatting, storage layout and system overhead reduce usable capacity; a mirror does not add both drive capacities.
Western Digital / NAS hard drives
Western Digital Red Plus WD40EFPX (4 TB)
A 4 TB CMR SATA drive with a published 180 TB/year workload rating and 3-year limited warranty; exact NAS pairing remains unverified.
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At a glance
Rated annual workload
180 TB/year
Keep the source definition and operating conditions. A higher rating does not guarantee a longer life or replace a backup.
Source · 2026-10-13
Western Digital: WD40EFPX exact-model specificationsChecked 2026-10-13. We reviewed the official page text on the check date. Checkout options were not verified.Limited warranty term
3 years
Check seller, condition, region and serial-number eligibility; used, refurbished and OEM offers can have different coverage.
Limited manufacturer warranty; verify the eligibility of the delivered new-drive serial number and seller.
Source · 2026-10-13
Western Digital: WD40EFPX exact-model specificationsChecked 2026-10-13. We reviewed the official page text on the check date. Checkout options were not verified.The purchase package
Red Plus WD40EFPX (4 TB) (US single drive)
Select the exact part number and capacity. A different suffix, condition or seller can change the hardware and warranty scope. No enclosure, drive-pair compatibility result, current price or available-stock claim is included. Confirm any cables or mounting accessories with the seller.
Source · 2026-10-13
Western Digital: WD40EFPX exact-model specificationsChecked 2026-10-13. We reviewed the official page text on the check date. Checkout options were not verified.Select: WD40EFPX, 4 TB, new single internal drive; not recertified, used, a multi-pack or a NAS enclosure.
View at Western Digital — Red Plus WD40EFPX (4 TB) (US single drive); opens in a new tabThe link may open several packages. Check current price and availability with the seller. Opens in a new tab.
Specifications & sources
New internal 3.5-inch SATA hard drives for US NAS buyers. Enclosures, SSD cache and tested interoperability are separate buying tasks.
Open a field explanation or source for its conditions.
| Compare the details | Red Plus WD40EFPX (4 TB) (US single drive) |
|---|---|
| US purchase package | WD40EFPX, 4 TB, new single internal drive; not recertified, used, a multi-pack or a NAS enclosure. Select the exact part number and capacity. A different suffix, condition or seller can change the hardware and warranty scope. No enclosure, drive-pair compatibility result, current price or available-stock claim is included. Confirm any cables or mounting accessories with the seller. Source · 2026-10-13Western Digital: WD40EFPX exact-model specificationsChecked 2026-10-13. We reviewed the official page text on the check date. Checkout options were not verified. |
Nominal capacityManufacturer capacity of the exact drive model. Formatting, storage layout and system overhead reduce usable capacity; a mirror does not add both drive capacities. | 4 TBSource · 2026-10-13Western Digital: WD40EFPX exact-model specificationsChecked 2026-10-13. We reviewed the official page text on the check date. Checkout options were not verified. |
Physical format and interfaceDocumented drive size and connection family. Check the NAS bay and interface. SATA hardware alone does not establish an approved drive and firmware pairing. | 3.5-inch SATASource · 2026-10-13Western Digital: WD40EFPX exact-model specificationsChecked 2026-10-13. We reviewed the official page text on the check date. Checkout options were not verified. |
Recording methodThe recording method explicitly stated for this part number. CMR is a recording technology, not a measured reliability score or a NAS compatibility certificate. | CMRSource · 2026-10-13Western Digital: WD40EFPX exact-model specificationsChecked 2026-10-13. We reviewed the official page text on the check date. Checkout options were not verified. |
Spindle speedManufacturer-reported rotational speed for the exact capacity and model. Do not transfer a speed from another capacity in the same family or use RPM alone to predict noise or application performance. | 5400 rpmSource · 2026-10-13Western Digital: WD40EFPX exact-model specificationsChecked 2026-10-13. We reviewed the official page text on the check date. Checkout options were not verified. |
Drive cacheCache capacity listed for the exact model. Cache size does not measure sustained file-transfer speed; similarly named drives may use different cache capacities. | 256 MBSource · 2026-10-13Western Digital: WD40EFPX exact-model specificationsChecked 2026-10-13. We reviewed the official page text on the check date. Checkout options were not verified. |
Rated annual workloadThe manufacturer annual workload rating, not a lifetime write allowance. Keep the source definition and operating conditions. A higher rating does not guarantee a longer life or replace a backup. | 180 TB/yearSource · 2026-10-13Western Digital: WD40EFPX exact-model specificationsChecked 2026-10-13. We reviewed the official page text on the check date. Checkout options were not verified. |
Limited warranty termPublished manufacturer limited-warranty duration for the reviewed new-drive scope. Check seller, condition, region and serial-number eligibility; used, refurbished and OEM offers can have different coverage. | 3 yearsLimited manufacturer warranty; verify the eligibility of the delivered new-drive serial number and seller.Source · 2026-10-13Western Digital: WD40EFPX exact-model specificationsChecked 2026-10-13. We reviewed the official page text on the check date. Checkout options were not verified. |
Published maximum transfer rateA source-specific maximum sequential or sustained transfer figure. Manufacturer methods differ. This is not a CompareFoundry benchmark, network rate or guaranteed speed throughout the disk. | 180 MB/sManufacturer maximum for this exact part; not a measured NAS or network result.Source · 2026-10-13Western Digital: WD40EFPX exact-model specificationsChecked 2026-10-13. We reviewed the official page text on the check date. Checkout options were not verified. |
Drive weightThe published weight of the drive, not its shipping package. Use the NAS installation instructions; a weight figure does not describe operating clearance, vibration or supplied mounting hardware. | 570 gSource · 2026-10-13Western Digital: WD40EFPX exact-model specificationsChecked 2026-10-13. We reviewed the official page text on the check date. Checkout options were not verified. |
Verified NAS and firmware pairingAn exact enclosure, drive and firmware compatibility result, when separately established. An unknown entry means this catalogue has not established the pairing. It does not mean that the drive is incompatible. | Not verifiedWe have not verified this value. It is not a confirmed no or zero. Check the original source or ask the manufacturer if it affects your choice. |
| Questions to check before buying | Read the source notes for the exact package and operating conditions. |
Community reviews
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