Western Digital WD RedPlus Internal HDD 4TB CMR 3.5 Inch SATA Cache 128MB 5400rpm NAS Compatible WD40EFZZ-AJP Eco Package

Brand Name Western Digital
Model Number WD40EFZZ
Hard Disk Type Mechanical Hard Disk
Model Name RedPlus

CMR (This Drive): Writes data in straight tracks. It is significantly faster and more reliable for RAID arrays and continuous NAS workloads.

SMR (Standard WD Red): “Shingles” data tracks on top of each other. While cheaper to make, SMR drives can cause massive slowdowns or even “drop” from a RAID array during heavy rebuilds

Western Digital WD RedPlus Internal HDD 4TB CMR 3.5 Inch SATA Cache 128MB 5400rpm NAS Compatible WD40EFZZ-AJP Eco Package

Home NAS (Synology, QNAP, TrueNAS): Specifically tuned for multi-bay environments.

Plex Media Server: The 5400 RPM speed is plenty for streaming 4K video while keeping noise levels low in a living room.

Long-term Archiving: Reliable enough for “set it and forget it” backups.