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Silver rectangular 3.5 inch hard drive with silver label

Seagate

Seagate ST20000NM007D Exos X20 20 TB 7.2K SATA 3.5" 4Kn

SKU CH-DJE3-61339

High-capacity 20 TB SATA hard drive built for 24×7 NAS workloads in a 3.5-inch form factor

  • Total capacity20 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Massive 20 TB capacity stores extensive data libraries
  • 2K RPM spindle delivers responsive throughput
  • SATA 6.0 Gb/s interface ensures broad host compatibility
  • 4Kn sector format optimises storage efficiency
  • Engineered for 24×7 operation in multi-bay NAS

Capacity and interface

This 20 TB hard drive uses a SATA 6.0 Gb/s interface in a 3.5 inch form factor. It spins at 7.2K rpm and uses 4Kn sector technology. The drive is built for continuous 24x7 operation in multi-bay NAS enclosures.

Suited for high-capacity NAS, not for laptops

The 3.5 inch size and 7.2K spindle speed make this drive appropriate for desktop NAS chassis with 1 to 8 bays. It is not suitable for laptop drive bays or for systems that require a 2.5 inch form factor. Buyers needing a portable or mobile-optimised drive should look elsewhere.

4Kn sector format requirement

The drive presents 4 KB native sectors to the host. The controller, operating system and any RAID layer must support 4Kn addressing. Without that support the drive will not be recognised or will report incorrect capacity.

How it compares

Measured against everything we stock in 2.5-Inch Internal Laptop HDDs, at today’s prices. Recalculated every night.

Price $565.99
Pricier than about 90% of the 645 comparable items (median $66.99).
Total capacity 20 TB
Higher than about 98% of the 419 comparable items (median 320 GB).
Price per TB $28.30 per TB
Cheaper than about 97% of the 416 comparable items (median $233.48 per TB).

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Specifications

Product
Brand nameSeagate
Part numberST20000NM007D
Total capacity20 TB
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)

Questions about this item

What does the SATA 6.0 Gb/s interface cap in practice?

The SATA 6.0 Gb/s interface limits the drive to a maximum theoretical throughput of 6.0 Gb/s, which is the standard ceiling for this connection type.

What physical space is required to fit this 3.5" drive?

The drive requires a standard 3.5-inch drive bay and the matching SATA data and power connectors to install.

How is the drive installed and what step is often missed?

Mount the drive in a 3.5-inch bay, attach both SATA data and power cables, then ensure the operating system supports 4Kn native sectors before partitioning.

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