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Silver rectangular 3.5 inch internal hard drive bare drive

Western Digital

Western Digital WD20EFRX Red Plus 2TB 5400 RPM 64MB SATA 3.5" internal hard drive

SKU CH-MZEN-QSK2V MPN WD20EFRX

2 TB internal hard drive built for 24×7 NAS workloads up to 180 TB per year with NASware firmware and 64 MB cache

  • Total capacity2 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Flash memory typeHard Drive
  • Rotational speed5,400 RPM
  • Built for 24x7 NAS operation with NASware firmware
  • Handles up to 180 TB per year workload rate
  • Fits small NAS enclosures with support for up to 8 drive bays
  • 64 MB cache buffer speeds up data access
  • SATA 6.0 Gb/s interface delivers fast burst performance

WD Red Plus 2 TB NAS drive

The Western Digital WD20EFRX is a 2 TB SATA hard drive built for small or medium business NAS enclosures with up to eight bays. It runs at a 5400 RPM performance class and carries a 64 MB cache to handle continuous 24x7 workloads.

CMR storage and 180 TB yearly workload rating

The drive uses conventional magnetic recording and is rated for up to 180 TB per year, making it suited for RAID arrays that run around the clock. Its 3.5 inch form factor fits standard NAS trays and the SATA 6.0 Gb/s interface connects directly to common NAS backplanes.

Upgrade from desktop drives in always-on NAS

Desktop drives lack the firmware and workload rating needed for multi-bay NAS that never spin down. This model adds NASware firmware for compatibility and a three-year limited warranty, so the jump is worth it when the array must stay online day and night.

How it compares

Measured against everything we stock in 3.5-Inch Internal Desktop HDDs, at today’s prices. Recalculated every night.

Price $75.99
Cheaper than about 61% of the 4,938 comparable items (median $107.99).
Total capacity 2 TB
Typical for this category: the median of 2,372 items is 2 TB.
Price per TB $38.00 per TB
Cheaper than about 72% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWD
Product lineRed Plus
Model nameWD20EFRX
Total capacity2 TB
Recommended useFor NAS systems
Performance
Rotational speed5,400 RPM
Storage
Flash memory typeHard Drive
Cache memory64 MB
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Max height26.1 mm
Maximum width101.6 mm
Maximum length147 mm
Shipping weight0.61 kg
Package size150 × 102 × 25 mm

Questions about this item

What practical limit does the SATA 6.0Gb/s interface impose on this 2TB drive?

The SATA 6.0Gb/s interface caps burst transfer at 6Gb/s, while sustained throughput is limited by the 5400 RPM platters and 64MB cache.

What are the exact dimensions needed to confirm this 3.5-inch drive fits my NAS bay?

The drive measures 147.00mm long, 101.60mm wide and 26.10mm high, matching the standard 3.5-inch form factor.

How is the drive installed in a NAS, and what step is often missed?

Mount the bare drive in a 3.5-inch bay using four screws, connect SATA data and power cables, then ensure the NAS firmware recognises the new volume before adding data.

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