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Silver 3.5 inch SAS hard drive with circuit board visible

DELL

DELL 391KC 8TB 3.5" SAS 7.2K 12Gb/s internal hard drive

SKU CH-AEV9-T349G

An 8 TB 3.5-inch SAS drive spinning at 7200 RPM with a 12 Gb/s transfer rate

  • Total capacity8 TB
  • Interface typeSAS 12Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Rotational speed7,200 RPM
  • Mean latency12Gb/s
  • 8 TB capacity stores large datasets
  • 7200 RPM spindle delivers responsive throughput
  • SAS 12 Gb/s interface enables fast host transfers
  • 5 inch form factor fits standard drive bays
  • Dell part 391KC ensures genuine compatibility

Dell 391KC 8TB Nearline SAS Drive

The Dell 391KC is an 8TB 3.5-inch nearline SAS hard drive spinning at 7200 RPM. It is built for desktop or server storage arrays that require high-capacity bulk storage with a 12Gb/s SAS interface.

Verify SAS Controller and Bay Compatibility

Before ordering confirm that your system has a SAS host bus adapter or RAID controller with a free 12Gb/s port. You also need an available 3.5-inch drive bay and the correct power and data cables for a bare drive.

Thermals Noise and Power in Normal Use

As a 7200 RPM mechanical drive it generates noticeable vibration and audible seek noise during heavy workloads. Typical power draw rises during spin-up and sustained transfers so ensure your chassis airflow can handle the additional heat.

How it compares

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

Price $268.99
Pricier than about 79% of the 4,938 comparable items (median $107.99).
Total capacity 8 TB
Higher than about 80% of the 2,372 comparable items (median 2 TB).
Price per TB $33.62 per TB
Cheaper than about 78% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameDell
Model name391KC
Total capacity8 TB
Performance
Rotational speed7,200 RPM
Mean latency12Gb/s
Ports & slots
Interface typeSAS 12Gb/s
Size & build
Form factor3.5 in (8.89 cm)

Questions about this item

Does the Dell 391KC 8TB 3.5" SAS drive ship with a mounting tray or cables, or must they be sourced separately?

The drive is supplied as a bare unit without a tray or cables; a compatible SAS backplane and power lead are required for installation.

How do I decide between the 12Gb/s SAS interface and the 7200 RPM spindle speed for my workload?

The 12Gb/s SAS link sets the maximum data-transfer ceiling, while 7200 RPM governs rotational latency; together they suit nearline storage that balances throughput with capacity.

What does the 12Gb/s transfer rate mean for real-world throughput once the drive is in a server?

The 12Gb/s figure is the interface peak; sustained read and write speeds will be lower and depend on the controller, queue depth and the 7200 RPM mechanical limits.

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