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Silver 3.5 inch internal hard drive with SATA connectors

Western Digital

Western Digital WD103KFBX 10TB 7200 RPM 512MB Cache 3.5" SATA internal hard drive

SKU CH-8K7P-FA41R MPN WD103KFBX

10 TB 7200 RPM CMR desktop drive with 512 MB cache and SATA 6.0 Gb/s interface for up to 24-bay NAS systems

  • Total capacity10 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Recording methodCMR
  • Rotational speed7,200 RPM
  • Cache memory512 MB

Capacity 10TB

Show 4 more
  • Engineered for 24-bay NAS reliability with CMR technology
  • 300TB yearly workload rating supports heavy multi-user access
  • 7200 RPM and 512MB cache deliver responsive RAID performance
  • 5-year limited warranty reflects extended drive testing standards
  • 5-inch SATA 6.0Gb/s form factor fits standard enterprise bays

10TB CMR Drive for Enterprise NAS

The WD Red Pro WD103KFBX is a 10TB 3.5-inch internal hard drive built for 24/7 multi-user NAS environments. It uses CMR recording technology and a SATA 6.0Gb/s interface to deliver sustained performance in commercial and enterprise storage arrays. A 512MB cache and 7200 RPM spindle speed support high-throughput workloads. Extended factory testing and NASware 3.0 firmware enhance reliability for continuous operation.

Suits Multi-Bay RAID Arrays.

This drive targets businesses running NAS systems with up to 24 drive bays and workloads up to 300TB per year. It is designed for multi-bay RAID configurations where vibration tolerance and error recovery controls matter. Builders assembling a single-bay NAS, a standard desktop PC, or an external enclosure without RAID support will not benefit from the enterprise feature set. Shoppers needing a portable or solid-state device should consider a different form factor.

512MB Cache Buffers Heavy Random I/O

The 512MB cache is the key specification that determines suitability for metadata-heavy workloads such as virtualisation, database logging or multi-user file sharing. Larger cache capacity absorbs bursty write traffic and reduces latency during concurrent access. If the target workload is primarily sequential archival or cold storage, a drive with a smaller cache may be sufficient. Verify that the host NAS supports SATA 6.0Gb/s to utilise the full interface bandwidth.

How it compares

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

Price $374.99
Pricier than about 88% of the 4,938 comparable items (median $107.99).
Total capacity 10 TB
Higher than about 85% of the 2,372 comparable items (median 2 TB).
Price per TB $37.50 per TB
Cheaper than about 73% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWestern Digital
Product lineRed Pro
Model nameWD103KFBX
Total capacity10 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 weight0.84 kg
Package size194 × 130 × 64 mm

Other versions of this model

5 more in the same range

Questions about this item

Will the 147.00mm length and 26.10mm height fit my 3.5-inch drive bay?

The drive measures 147.00mm long, 101.60mm wide and 26.10mm high, matching the standard 3.5-inch form factor used in most desktop and NAS chassis.

Do I need a special SATA cable or controller for the 6.0Gb/s interface?

Connect the drive with a standard SATA data cable and a SATA power connector; the 6.0Gb/s link negotiates automatically with any SATA 3Gb/s or 6Gb/s port.

How often should I expect to replace a drive rated for 300TB per year?

The 300TB/year workload rating is a design target; actual replacement depends on your write volume, RAID layout and environmental conditions.

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