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Silver 3.5 inch enterprise hard drive with SAS connectors

Seagate

Seagate ST18000NM000D Exos X20 18TB 7200 RPM 256MB SAS 12Gb/s 3.5 internal hard drive

SKU CH-VB1E-VVSEB MPN ST18000NM000D

Enterprise 18 TB SAS drive with 7200 RPM, 256 MB cache and CMR recording for high-capacity storage arrays

  • Total capacity18 TB
  • Interface typeSAS 12Gb/s
  • Form factor3.5 in (8.89 cm)
  • Recording methodCMR
  • Rotational speed7,200 RPM
  • Cache memory256 MB
  • 18TB capacity stores massive datasets in a single 3.5" drive
  • 7200 RPM and 256MB cache deliver high throughput for enterprise workloads
  • SAS 12Gb/s interface enables fast, reliable data transfers
  • CMR recording technology ensures consistent write performance
  • Helium-sealed design reduces power per terabyte and weight

Enterprise Capacity Drive

The Seagate Exos X20 ST18000NM000D is an 18TB 3.5-inch internal hard drive built for enterprise storage arrays. It runs at 7200 RPM with a 256MB cache and uses conventional magnetic recording technology. The SAS 12Gb/s interface supports high-throughput workloads in rack-mounted systems.

Suited For High-Density Racks

This drive targets cloud data centres and massive scale-out deployments that need maximum petabytes per rack. Its helium-sealed design and PowerBalance feature optimise watts per terabyte for lower operating costs. Buyers who need a SATA interface or a non-enterprise drive for desktop or small-business NAS should look at other models.

Deciding Specification SAS 12Gb/s

The single specification that decides fit is the SAS 12Gb/s interface, which requires a compatible controller or backplane. Without SAS infrastructure the drive cannot be used, so verify your host bus adapter and enclosure support before purchase.

How it compares

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

Price $390.99
Pricier than about 90% of the 4,938 comparable items (median $107.99).
Total capacity 18 TB
Higher than about 93% of the 2,372 comparable items (median 2 TB).
Price per TB $21.72 per TB
Cheaper than about 91% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineExos X20
Model nameST18000NM000D
Total capacity18 TB
Recommended useFor Enterprise Storage
Performance
Rotational speed7,200 RPM
Mean latency4.16 ms
Storage
Recording methodCMR
Cache memory256 MB
Ports & slots
Interface typeSAS 12Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Max height26.1 mm
Maximum width101.85 mm
Maximum length147 mm
Shipping weight0.91 kg
Package size196 × 152 × 76 mm

Questions about this item

What does the SAS 12Gb/s interface cap in practice?

The SAS 12Gb/s interface caps the theoretical maximum transfer rate at 12 gigabits per second, with actual sustained throughput limited by the 7200 RPM mechanics and 256MB cache.

What physical space and mounting does the 3.5-inch form factor need?

The drive measures 147.00mm long, 101.85mm wide and 26.10mm high, fitting a standard 3.5-inch drive bay with bottom and side mounting points.

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

Connect the SAS data and power cables, secure the drive with four screws in the chassis bay, then configure the drive in the RAID controller or HBA BIOS so the operating system can see the 18TB volume.

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