Western Digital WD Red Plus 4TB NAS Hard Drive – 3.5" SATA III, 128MB Cache, 24/7 Rated (WD40EFZZ)

Your NAS runs around the clock and you don't want a drive designed for a desktop that shuts down at 5pm. The WD Red Plus 4TB (WD40EFZZ) is built for exactly that — small business and home NAS boxes, up to 8 bays, rated for 180TB of writes a year without breaking a sweat.

CMR recording means your data lands where it should. No SMR shuffling behind the scenes while you're backing up the weekend's invoices or syncing the school's photo archive. 128MB cache, SATA III interface, up to 180MB/s sustained transfer. NASware firmware is already on the drive — drop it into your Synology, QNAP, or TrueNAS bay and go.

3-year limited warranty. 0.55kg. Standard 3.5" form factor (146.99 × 101.6 × 26.11mm). If you need another 4TB on the shelf this week rather than three weeks from a marketplace, this is the one.

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• 4TB capacity with CMR recording — no SMR write-penalty surprises during overnight backups
• Rated for 24/7 operation and up to 180TB/year workload; built for small business NAS, not a weekend desktop
• Supports NAS systems with up to 8 bays; ships with NASware firmware for plug-and-play compatibility
• SATA III interface, 128MB cache, up to 180MB/s sustained transfer rate
• 3-year limited warranty from Western Digital
• Standard 3.5" form factor (146.99 × 101.6 × 26.11mm, 0.55kg) — fits any common NAS bay