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Silver 3.5 inch internal hard drive with green circuit board visible on underside

Seagate

Seagate ST6000DM003 6TB 3.5" SATA 5400 RPM 256MB internal hard drive

SKU CH-0B6H-17EEF MPN ST6000DM003

A 6TB 3.5-inch SATA desktop drive with 256MB cache and 5400 RPM for high-capacity storage

  • Total capacity6 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Rotational speed5,400 RPM
  • Cache memory256 MB
  • Mean latency6Gb/s

Model 6TB 5400RPM

  • 6 TB capacity stores large media libraries
  • 256 MB cache boosts burst transfer speeds
  • 5400 RPM spindle balances performance and power draw
  • SATA 6.0 Gb/s interface fits standard desktop bays
  • 11 mm height suits typical 3.5 inch drive trays

6TB BarraCuda desktop drive

The Seagate BarraCuda ST6000DM003 is a 3.5-inch internal hard drive with a 6TB capacity and a SATA 6.0Gb/s interface. It spins at 5400 RPM and includes a 256MB cache to handle everyday desktop workloads. The drive measures 146.99mm long, 101.85mm wide and 26.11mm high, fitting standard drive bays. It is designed for daily computing tasks such as storing games, media and documents.

Upgrade from smaller mechanical drives

Replacing a lower-capacity 3.5-inch hard drive with this 6TB model adds substantial space for large libraries without changing the mounting or cabling. The jump is worthwhile when your current drive is full or too slow for bulk file access and you want a single volume up to 8TB. The SATA 6.0Gb/s interface maintains compatibility with existing desktop motherboards and controllers.

Check bay clearance and SATA ports

Verify that your case has a free 3.5-inch bay with at least 26.11mm of vertical clearance and 146.99mm of depth for the drive. Confirm the motherboard or controller has an available SATA 6.0Gb/s port and that your power supply provides a spare SATA power connector. The drive uses standard SATA data and power connections with no special mounting hardware required.

How it compares

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

Price $118.99
Typical for this category: the median of 4,938 items is $107.99.
Total capacity 6 TB
Higher than about 75% of the 2,372 comparable items (median 2 TB).
Price per TB $19.83 per TB
Cheaper than about 92% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineBarraCuda
Model nameST6000DM003
Total capacity6 TB
Recommended useFor Daily Computing
Performance
Rotational speed5,400 RPM
Mean latency6Gb/s
Storage
Cache memory256 MB
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Max height26.11 mm
Maximum width101.85 mm
Maximum length146.99 mm
Shipping weight0.62 kg
Package size150 × 102 × 36 mm

Other versions of this model

5 more in the same range

Questions about this item

What are the exact dimensions of this 3.5 inch drive for case clearance?

The drive measures 146.99 mm long, 101.85 mm wide and 26.11 mm high, so check your drive bay or bracket against those figures before ordering.

Which cables and jumpers are needed to install the SATA 6.0Gb/s interface correctly?

Connect a standard SATA data cable to the motherboard and a SATA power lead from the PSU; no jumpers are required on this drive.

When should the 256MB cache or the 5400 RPM mechanism be monitored for replacement?

Run SMART checks periodically; rising reallocated-sector counts or increasing seek errors signal that the 6000 GB drive is nearing end of life.

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