WD WD40EFZX Hard Disk Drive

Dependable, NAS-optimized storage for continuous business use. The Western Digital WD Red Plus WD40EFZX 4TB NAS hard drive delivers the reliability and compatibility IT teams need for file sharing, backup and 24/7 surveillance monitoring. Built for small- to medium-sized NAS systems, this WD Red Plus drive combines 4TB capacity with a 128MB buffer and SATA/600 interface to speed access to large datasets, video streams and virtualized storage.

Engineered with NASware firmware and tuned for RAID environments, the WD40EFZX reduces rebuild times and improves array stability so you can focus on security, data protection and uninterrupted monitoring. It supports up to a 180TB/year workload and is optimized for up to 8-bay enclosures—making it a smart choice for SOHO, SMB and edge surveillance installations. Environmentally conscious and backed by a 3-year limited warranty, this internal 3.5" drive balances performance, durability and compatibility.

Add the WD WD40EFZX to your NAS, backup pool or surveillance storage array to enhance reliability and simplify long-term monitoring. Order now to upgrade your storage infrastructure.

• NAS-optimized reliability for 24/7 operation, minimizing downtime for business storage and surveillance monitoring
• RAID-ready performance that simplifies rebuilds and protects critical data in multi-bay NAS arrays
• 4TB capacity with 128MB cache for fast access and efficient handling of large video, backup and archive files
• Supports up to 180TB/year workload and is tuned for up to 8-bay systems, ideal for small/medium business and SOHO deployments
• Backed by a 3-year limited warranty and NASware compatibility to ensure seamless integration with leading NAS enclosures