WD Red Pro WD4001FFSX 4TB 7200 RPM 128MB Cache SATA 6.0Gb/s 3.5" NAS Internal Hard Drive (Used)

The WD Red Pro WD4001FFSX is a 4TB enterprise-grade NAS hard drive engineered for always-on, high-demand RAID and NAS environments. Spinning at a full 7200 RPM with a generous 128MB cache and a SATA 6.0Gb/s interface, this 3.5" drive delivers the sustained throughput and responsiveness that busy NAS arrays demand — a significant step above consumer-class storage. Whether you're expanding an existing array or building out a high-performance NAS system, the WD4001FFSX is purpose-built to handle the workload.

Specifications

• Part Number: WD4001FFSX
• Brand: WD (Western Digital)
• Series: WD Red Pro
• Capacity: 4TB
• Spindle Speed: 7200 RPM
• Cache: 128MB
• Interface: SATA 6.0Gb/s
• Form Factor: 3.5"
• Use Case: NAS / RAID

Condition

This drive is sold in used condition and has been put through a rigorous multi-point testing protocol to verify full functionality. It is professionally cleaned and repackaged in custom protective packaging before shipment — so it arrives ready to install and perform. Backed by a 90-day warranty for complete peace of mind.

Why Buy From Us

We specialize in enterprise and NAS-class storage, and every used drive we ship has earned it. Our multi-point testing and inspection process, professional cleaning, and industry-leading protective packaging ensure you receive a drive that's reliable from day one. Add in free 2-day shipping on most products and a 90-day warranty, and you get premium-tier hardware at a fraction of the new price — with the confidence of a professional seller behind every order.