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Standard 3.5-inch bare hard drive, silver aluminium casing, SATA connectors visible

Seagate

Seagate Exos X 28TB 3.5" SATA 7200 RPM 512MB Cache ST28000NM000C

SKU CH-XRRK-MMS5T MPN ST28000NM000C

High-capacity 28 TB enterprise hard drive with 7200 RPM, 512 MB cache and SATA 6.0 Gb/s interface for hyperscale storage

  • Total capacity28 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Rotational speed7,200 RPM
  • Cache memory512 MB
  • 28 TB capacity fits massive datasets in a single 3.5" drive
  • 7200 RPM and 512 MB cache accelerate large sequential transfers
  • 5 million-hour MTBF rating supports continuous enterprise workloads
  • Helium side-sealing weld protects against leaks and handling stress
  • SATA 6.0 Gb/s interface integrates with existing NAS and RAID arrays

28 TB Enterprise SATA Hard Drive

The Seagate Exos X 28TB is a 3.5-inch internal hard drive built for enterprise NAS and hyperscale storage. It spins at 7200 RPM with a 512MB cache and uses a SATA 6.0Gb/s interface. The helium-sealed design supports 28TB capacity in a standard form factor.

SATA 6.0Gb/s Interface Limits

The drive connects through a SATA 6.0Gb/s link, so maximum throughput cannot exceed that bus speed. Average latency is 4.16ms at 7200 RPM. Sustained transfer rates will be bounded by the SATA interface rather than the drive media.

Check Bay Space And Power Budget

Verify your chassis has a 3.5-inch bay with at least 26.10mm height, 101.85mm width and 147.00mm length clearance. Ensure the power supply delivers sufficient 12V and 5V current for a 7200 RPM helium drive. Confirm the motherboard or controller provides a SATA 6.0Gb/s port.

How it compares

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

Price $209.99
Pricier than about 71% of the 4,938 comparable items (median $107.99).
Total capacity 28 TB
Higher than about 98% of the 2,372 comparable items (median 2 TB).
Price per TB $7.50 per TB
Cheaper than about 99% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineExos
Model nameST28000NM000C
Part numberST28000NM000C
Total capacity28 TB
Recommended useEnterprise NAS Hard Drives
Performance
Rotational speed7,200 RPM
Mean latency4.16 ms
Storage
Cache memory512 MB
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Max height26.1 mm
Maximum width101.85 mm
Maximum length147 mm
Shipping weight0.45 kg
Package size254 × 178 × 76 mm

Questions about this item

Which capacity version of the Seagate Exos X should I choose for a high-density NAS build?

The ST28000NM000C provides 28TB in a single 3.5-inch drive, letting you reach multiple petabytes per rack with fewer bays than lower-capacity models.

What does the 7200 RPM rating mean for daily throughput in a RAID array?

At 7200 RPM with 4.16ms average latency and a 512MB cache, the drive sustains the high sequential speeds needed for large-file workloads such as backup, media ingest, and distributed file systems.

How does the SATA 6.0Gb/s interface limit real-world transfer rates?

The SATA 6.0Gb/s link caps the theoretical maximum at 6.0Gb/s, so sustained reads and writes will top out below that ceiling once protocol overhead and drive mechanics are accounted for.

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