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Silver 3.5 inch internal hard drive with SATA connectors and label showing WD Blue 12TB

Western Digital

Western Digital WD120EAGZ 12TB 7200 RPM 512MB Cache SATA 3.5" internal hard drive

SKU CH-34ZF-D6ZQP MPN WD120EAGZ

A 12 TB CMR desktop drive with 7200 RPM and 512 MB cache for reliable everyday storage

  • Total capacity12 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Recording methodCMR
  • Rotational speed7,200 RPM
  • Cache memory512 MB

Model 12TB 512MB Cache

  • 12 TB capacity for large media libraries
  • 7200 RPM speed for responsive everyday computing
  • 512 MB cache to smooth heavy workloads
  • CMR recording technology for consistent write performance
  • SATA 6.0 Gb/s interface for broad desktop compatibility

12 TB SATA desktop drive

The Western Digital WD120EAGZ is a 12 TB 3.5-inch internal hard drive that spins at 7200 RPM and carries a 512 MB cache. It connects through a SATA 6.0 Gb/s interface and uses CMR recording technology for consistent write performance.

Built for bulk storage on a desktop

This drive suits users who need large, affordable capacity for documents, media libraries or backups on a standard desktop PC. It is not intended for laptops, small-form-factor systems or any device that cannot accommodate a 3.5-inch bay with 26.10 mm height clearance.

Steady throughput under sustained writes

The 7200 RPM spindle and generous cache keep sequential transfer rates stable during long copy jobs or continuous recording workloads. Acoustic output and vibration remain at typical desktop levels even when the drive runs for extended periods.

How it compares

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

Price $352.99
Pricier than about 86% of the 4,938 comparable items (median $107.99).
Total capacity 12 TB
Higher than about 90% of the 2,372 comparable items (median 2 TB).
Price per TB $29.42 per TB
Cheaper than about 83% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWD
Product lineBlue
Model nameWD120EAGZ
Total capacity12 TB
Recommended useFor Daily Computing
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 weight0.73 kg
Package size152 × 102 × 25 mm

Other versions of this model

4 more in the same range

Questions about this item

What type of SATA port and power connector does the WD120EAGZ require?

The drive connects to a standard SATA 6.0Gb/s port and uses a regular 15-pin SATA power connector from your power supply.

Will the 7200 RPM speed and 512MB cache of this 12TB drive work with an older motherboard limited to SATA 3.0Gb/s?

Yes, the SATA 6.0Gb/s interface is backwards compatible; the drive will run at the older bus speed while keeping its 7200 RPM spindle and 512MB cache.

How can I verify the WD120EAGZ is healthy and performing at 7200 RPM after installation?

Check SMART attributes for zero reallocated sectors and use a benchmark tool to confirm sustained transfer rates consistent with a 7200 RPM CMR drive.

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