Western Digital Red Plus 4TB WD40EFPX

Western Digital Red Plus 4TB NAS 5400 RPM SATA 6 Gb/s CMR 256 MB Cache 3.5" WD40EFPX

Western Digital Red Plus 4TB NAS 5400 RPM SATA 6 Gb/s CMR 256 MB Cache 3.5" WD40EFPX

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  • Available in capacities ranging from 1-14TB(1) with support for up to 8 bays | (1) 1MB = 1 million bytes, 1GB = 1 billion bytes, and 1TB = 1 trillion bytes. Actual user capacity may be less depending on operating environment.
  • Supports up to 180 TB/yr workload rate(2) | (2) Workload Rate is defined as the amount of user data transferred to or from the hard drive. Workload Rate is annualized (TB transferred ✕ (8760 / recorded power-on hours)). Workload Rate will vary depending on your hardware and software components and configurations.
  • NASware firmware for compatibility
  • Built for small or medium business NAS systems in a 24/7 environment
  • 3-year limited warranty(3) | (3) MTBF specifications are based on a sample population and are estimated by statistical measurements and acceleration algorithms under typical operating conditions: workload of 90TB/year and drive temperature of 40°C. Derating of MTBF will occur above these parameters, up to 65°C drive temperature. MTBF does not predict an individual drive’s reliability and does not constitute a warranty. Not all products may be available in all regions of the world.

Specifications Overview

Model WD40EFPX
Release Date October 2022

* First availability for purchase, it may not correspond to the actual market launch date.

Capacity 4000 GB
Cache 256MB
RPM 5400
Interface SATA 6 Gb/s
Form Factor 3.5"


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