Western Digital WD40EFPX

Overview

The Western Digital WD40EFPX is a 4 TB internal hard drive designed specifically for network attached storage (NAS) systems. It fits into standard 3.5-inch bays and connects via a SATA 6 Gb/s interface, making it compatible with most popular NAS enclosures. With a 5400 RPM motor and a 256 MB cache, it delivers sustained transfer speeds up to 180 MB/s, providing reliable performance for shared files, media libraries, and backups.

Key features

• NASware firmware enhances power management, error recovery, and command handling to ensure smooth operation within RAID arrays and multi-drive setups.
• Designed for continuous 24/7 operation, making it suitable for small businesses and home users who require dependable, always-on storage.
• Integrated vibration protection maintains system stability in multi-bay NAS enclosures, reducing noise and wear.
• Large 256 MB cache helps maintain smooth data flow during heavy workloads and simultaneous access.
• Quiet operation and low power consumption support energy-efficient environments without sacrificing performance.
• Optimized for NAS systems with up to eight bays, providing flexibility for growing storage needs.
• Three-year limited warranty offers added confidence in long-term reliability.

Key specs

• Storage capacity: 4 TB
• Form factor: 3.5 inch
• Interface: SATA 6 Gb/s
• Spindle speed: 5400 RPM
• Cache size: 256 MB
• Sustained transfer rate: up to 180 MB/s
• Designed for 24/7 operation
• Warranty: three-year limited

Connectivity and compatibility

This hard drive connects through a SATA 6 Gb/s interface, which is widely supported by most NAS enclosures and motherboards. Its compatibility with RAID controllers and multi-drive arrays is enhanced by NASware firmware, ensuring seamless integration and data protection in networked storage environments.

Ideal uses and environments

The WD40EFPX is well suited to small and growing businesses that require reliable file servers running around the clock. It also fits home users who maintain media libraries, run Plex servers, or back up multiple computers. Its quiet operation and low power draw make it a practical choice for environments where noise and energy efficiency matter.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Shipping costs are calculated at checkout based on destination, total weight, and selected speed. Free shipping applies to carts over $100 (excluding heavyweight items). All available options and final pricing are clearly shown before payment so you can choose the service that best fits your needs.

Deliveries are handled by major carriers such as USPS, UPS, and FedEx. Estimated delivery times are displayed at checkout and may vary depending on service level and location. Please note that these are estimates and can be affected by weather, holidays, or carrier volume. Once your order ships, you’ll receive a tracking number for real-time updates from pickup to final delivery.

Providing an accurate shipping address helps prevent delays, and changes may be limited once the order has been dispatched. P.O. boxes are supported only when permitted by the selected carrier. Packaging and handoff are optimized to protect items during transit, though oversized or high-weight products may require special handling. All shipping methods and any related constraints are clearly shown during checkout.

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Returns are accepted within 30 days of delivery. Items must be unused, in the same condition received, with tags, manuals, accessories, and original, unaltered packaging. Any item kept will be deducted from the refund. Start a return by sending us an email. Items sent back without approval may be refused or returned to the sender.

Some items are not returnable: opened TVs/combos/monitors 37″+, opened computers or software, electronic downloads, opened consumables (film, paper, bulbs, media, ink), custom or modified computers, special-order or “nonreturnable” items, submerged underwater gear, and opened educational media.

After inspection, refunds are issued to the original payment method; allow 5–7 business days for the credit to post. Shipping, handling, customs duties, and import taxes are nonrefundable. If an item is used, incomplete, or not in original condition, a 30% restocking fee may apply. Direct exchanges are not offered; purchase the replacement and return the original for a refund.

We act solely as a reseller. Any product warranty is provided and administered by the manufacturer, not by our store. That means eligibility, coverage, and outcomes are determined by the manufacturer’s policy for each brand and model. Before purchasing, we recommend reviewing the warranty terms on the manufacturer’s website or in the product documentation to confirm what is covered and for how long.

If you need warranty service, please file the claim directly with the manufacturer. They may require proof of purchase, the product serial number, original packaging, photos, or basic troubleshooting. Some brands ask you to register the product or obtain a case number before shipping it for repair or replacement. We don’t submit or approve claims, but we can point you to the correct support links and contact details.

Keep your invoice and packaging in a safe place, and report any functional issues to the manufacturer as soon as they appear. If you’re unsure whether a problem is covered, the manufacturer’s support team can confirm next steps and timelines. While we cannot intervene in decisions or outcomes, we’re happy to provide purchase documentation or guidance so you can move through the warranty process smoothly.

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