WD Red Plus Internal NAS Hard Drive — 4TB, 3.5-inch SATA — CMR NAS drive tuned for 24/7 RAID systems up to 8 bays
Free US shipping through Dec 31, 2026
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90-day worry-free returns · Free return shipping · Refund at the first carrier scan
Free US shipping through Dec 31, 2026 · 90-day worry-free returns — free return label, no restocking fee · Refund released at your return’s first carrier scan · Arrives damaged or defective? We make it right — Returns, Made Simple
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Built for the box that never turns off. Red Plus drives are tuned with WD's NASware firmware for RAID-optimized NAS systems up to 8 bays, running 24/7 with rotation-vibration sensors to stay calm in a crowded enclosure. This 4TB model uses CMR recording - the right choice for RAID rebuilds - at 5,400 RPM with a 128MB cache and transfers up to 180MB/s. WD rates it for 180TB/year workloads and a 1M-hour MTBF, with a 3-year limited warranty. The correct foundation for a home or small-studio NAS.
A NAS drive lives a different life from a desktop drive: it never really sleeps, it vibrates alongside its neighbors, and when a sibling drive fails, its rebuild is the moment of maximum danger. Red Plus is engineered for exactly that life in systems up to 8 bays. NASware firmware tunes the drive's behavior for RAID controllers and always-on operation, rotation-vibration sensors keep a crowded enclosure calm, and CMR recording means rebuilds and big writes do not fall off a cliff halfway through.
Four terabytes per bay is the home and small-studio sweet spot: a four-bay box in RAID 5 yields roughly twelve usable terabytes for a media library, photo archive, client files and PC backups, all served to the whole network around the clock. The 180TB/year workload rating and 1M-hour MTBF are the numbers that separate a NAS-rated drive from a desktop drive pressed into service it was not built for.
At 5,400 RPM it sips power and runs quietly enough for a living-room-adjacent rack or a home office. If you are building a home server, a family NAS or a small-business file box that other people's work depends on, start with drives rated for the job — Red Plus is that starting point, with a 3-year limited warranty behind it.
Specs: 4TB | 3.5in SATA 6Gb/s | 5,400 RPM | 128MB cache | CMR NASware | up to 180MB/s | Part # WD40EFZZ
Free US shipping, a 90-day return window, and your refund released at the first scan.
• Free standard US shipping on every order through December 31, 2026 — no code needed
• Orders processed in 1–3 business days; standard delivery in 5–7 business days (expedited 2–4 and express 1–2 when available)
• 90-day worry-free returns — free prepaid return label, no restocking fee, ever
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90-day worry-free returns · Free return shipping · Refund at the first carrier scan
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