This article covers ウエスタンデジタル WD Red Plus 2TB NAS用HDD.

Overview

Western Digital's WD Red Plus series is purpose-built for NAS environments, and the WD20EFPX 2TB model is one of the most popular choices for home and small-office users. This 3.5-inch internal hard drive spins at 5400 RPM and packs a 64MB cache. Unlike the entry-level WD Red (which uses SMR), the Red Plus employs CMR (Conventional Magnetic Recording) technology, ensuring consistent random write performance even under multi-user loads. It strikes a solid balance between reliability and cost, making it a mid-range workhorse for RAID arrays.

Compatibility Guide

The WD20EFPX uses the standard SATA 6Gb/s interface and a 3.5-inch form factor, fitting into almost any NAS chassis or desktop PC with available drive bays. Power is supplied via a standard SATA power connector. It works out of the box with major NAS operating systems (Synology DSM, QNAP QTS, TrueNAS, etc.) without additional drivers. If you plan to install it in a PC case with 2.5-inch bays only, you will need a mounting adapter. No special cooling is required, but decent airflow around the drive is recommended for long-term stability.

Product Info

This is the Western Digital WD Red Plus 2TB (model WD20EFPX), released as part of the ongoing Red Plus lineup. It carries a 3-year limited warranty and is rated for 550 TB per year workload. Pricing in Japan is around ¥25,000 (via ). It sits in the mid-range tier of NAS hard drives – more reliable than the SMR-based WD Red, but more affordable than the 7200 RPM Red Pro or enterprise-class WD Gold drives. View on (affiliate link)

Best Use Cases

Home NAS / Small Office NAS: Ideal for RAID 1, RAID 5, or RAID 6 configurations where write consistency is critical. With CMR technology, you won't experience write speed drops during rebuilds or heavy simultaneous access. Reliable Data Archiving: If you need a dependable drive for backups and long-term storage, the Red Plus's CMR design reduces the risk of read errors over time compared to SMR drives. * Budget-Conscious Builders: Users who want proven reliability without paying enterprise premiums. The Red Plus delivers excellent value for everyday NAS operations.

Things to Consider

The 5400 RPM spindle speed means sequential transfer rates are lower than 7200 RPM drives. For users who frequently move large media files (e.g., 4K video editors), a Red Pro or Gold series would be faster. The 2TB capacity may feel limited in 2026; consider whether your storage needs may quickly outgrow this size. Also, this drive is not recommended as a boot disk – use an SSD for your operating system. If you are building a new RAID array, purchase drives from the same batch or at least the same model for consistent performance. ## Specifications | Item | Specification | | --- | --- | | Model Number | WD20EFPX | | Capacity | 2 TB (2000 GB) | | Interface | SATA 6 Gb/s | | Form Factor | 3.5-inch | | Spindle Speed | 5400 RPM | | Cache | 64 MB | | Recording Technology | CMR (Conventional Magnetic Recording) | | Interface Transfer Rate | 600 MB/s | | Workload Rate | 550 TB/year | | Warranty | 3 Years | | Weight | Approx. 450 g |

Product Disclosure (Amazon)

  • Manufacturer: WD
  • Seller: SIDE FIELD 【兵庫県公安委員会 古物商許可 第631122400009号】
  • Fulfilled by: Amazon
  • ASIN: B0C4X31Q9F
  • Note: This article covers a manufacturer-made product based on Amazon listing details.