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Silver 3.5 inch SATA hard drive with circuit board visible

Seagate

Seagate ST6000NM021A 6TB 7200RPM 256MB SATA 3.5" internal hard drive

SKU CH-5ENJ-F12B9 MPN ST6000NM021A

Enterprise-grade 6TB 3.5" SATA hard drive with 7200 RPM, 256MB cache, and 550 TB/year workload rating for 24×7 operation

  • Total capacity6 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Flash memory typeSLC
  • Rotational speed7,200 RPM
  • Cache memory256 MB

Model 6TB Standard Model

  • 6 TB capacity stores massive data sets
  • 7200 RPM spindle speed accelerates read and write performance
  • 256 MB cache buffers bursts for smoother throughput
  • SATA 6.0 Gb/s interface enables fast host transfers
  • 550 TB yearly workload rating supports 24×7 enterprise duty

6 TB Enterprise Storage

The Seagate Exos 7E8 ST6000NM021A delivers six terabytes of capacity in a 3.5 inch form factor. It spins at 7200 RPM with a 256 MB cache and connects via a SATA 6.0 Gb/s interface. This new drive is built for continuous operation in bulk data environments.

Suited for RAID and data centres.

The drive targets 24×7 workloads such as replicated storage arrays and RAID systems where vibration tolerance and a high annual workload rating matter. It is not designed for mobile enclosures or external backup kits that require bus power or a smaller physical footprint. Buyers needing silent desktop storage may prefer lower-speed alternatives.

SATA 6.0 Gb/s interface decides compatibility

The single specification that determines fit is the SATA 6.0 Gb/s interface, which requires a matching motherboard or controller port and a standard 3.5 inch drive bay with SATA power and data cables. Without that connection the drive cannot be installed or used.

How it compares

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

Price $174.99
Pricier than about 64% of the 4,938 comparable items (median $107.99).
Total capacity 6 TB
Higher than about 75% of the 2,372 comparable items (median 2 TB).
Price per TB $29.17 per TB
Cheaper than about 84% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineExos 7E8
Model nameST6000NM021A
Total capacity6 TB
Performance
Rotational speed7,200 RPM
Storage
Flash memory typeSLC
Cache memory256 MB
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Shipping weight0.91 kg
Package size305 × 254 × 203 mm

Other versions of this model

4 more in the same range

Questions about this item

How do I install the 3.5" SATA 6.0Gb/s drive and what step is often missed?

Mount the drive in a 3.5" bay, attach both the SATA data cable and the SATA power connector from the PSU, then enable the SATA port in BIOS; the step often missed is connecting the power cable.

What maintenance or replacement will the Exos 7E8 drive need later?

No scheduled maintenance is required; the drive is rated for 550 TB per year workloads and a 2 million hour MTBF, so replacement is only needed if it fails or capacity is exceeded.

What limit appears first under sustained 24×7 use?

The 550 TB per year workload rating is the first limit; exceeding it can reduce the 2 million hour MTBF reliability target.

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