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Silver 3.5-inch internal hard drive with label showing WD Red Pro 20TB

Western Digital

Western Digital WD201KFGX 20TB 7200 RPM 512MB Cache 3.5" internal hard drive

SKU CH-RT6T-6CWDT MPN WD201KFGX

20 TB desktop drive with 7200 RPM, 512 MB cache and CMR recording for multi-bay NAS workloads up to 300 TB per year

  • Total capacity20 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Recording methodCMR
  • Rotational speed7,200 RPM
  • Cache memory512 MB
  • 20 TB capacity supports massive NAS storage
  • 7200 RPM spindle speed delivers high throughput
  • 512 MB cache accelerates frequent data access
  • CMR recording technology ensures consistent write performance
  • 3D Active Balance Plus reduces vibration in multi-bay systems

WD Red Pro 20 TB CMR NAS drive

The WD Red Pro WD201KFGX is a 20 TB 3.5-inch internal hard drive built for multi-bay NAS enclosures. It spins at 7200 RPM with a 512 MB cache and uses conventional magnetic recording on a SATA 6.0 Gb/s interface. The drive is rated for up to 300 TB per year workload and includes NASware 3.0 firmware for RAID optimisation.

Suits 24-bay RAID arrays.

This drive targets commercial and enterprise NAS systems that run 24/7 in RAID configurations of up to 24 bays. Its vibration sensors and dual-plane balance control are calibrated for dense, multi-drive chassis. Builders assembling a single-drive workstation or a portable USB enclosure will not benefit from these enterprise-grade features.

300 TB yearly workload rating decides fit

The 300 TB per year workload rate is the key specification that determines whether this drive matches the intended environment. Systems that continuously write and rewrite large datasets across many bays need this endurance ceiling; lighter workloads do not require it.

How it compares

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

Price $537.99
Pricier than about 90% of the 4,938 comparable items (median $107.99).
Total capacity 20 TB
Higher than about 94% of the 2,372 comparable items (median 2 TB).
Price per TB $26.90 per TB
Cheaper than about 87% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWD
Product lineRed Pro
Model nameWD201KFGX
Total capacity20 TB
Recommended useEnterprise NAS Hard Drives
Performance
Rotational speed7,200 RPM
Storage
Recording methodCMR
Cache memory512 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 weight0.68 kg
Package size152 × 102 × 26 mm

Questions about this item

Will this 20TB SATA drive work in my older 4-bay NAS that only supports drives up to 10TB?

The drive uses the standard SATA 6.0Gb/s interface, so it connects physically, but the NAS firmware must support 20TB volumes; check the manufacturer's compatibility list for your specific model.

How can I verify the 7200 RPM mechanism and 512MB cache are performing correctly after installation?

Run the NAS vendor's built-in SMART test or Western Digital's Data Lifeguard Diagnostic; both report spindle speed, cache size and health attributes to confirm the drive matches its specifications.

Does the retail box include mounting screws or a SATA cable, or do I need to buy them separately?

The drive ships as a bare 3.5-inch unit; mounting screws and SATA data/power cables are not included and must be sourced from your NAS chassis or purchased separately.

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