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A 3.5 inch internal SAS hard drive with a silver metal casing

Seagate

Seagate Exos X18 ST12000NM004J 12 TB SAS Hard Drive

SKU CH-A6WA-ZQDHK

Enterprise 12 TB SAS hard drive with helium-sealed design and 2.5M-hr MTBF for hyperscale storage

  • 12 TB SAS capacity for dense rack storage
  • Helium-sealed design reduces power per terabyte
  • 5M-hr MTBF rating for enterprise reliability
  • Seagate Secure enables fast drive retirement
  • Digital sensors monitor internal conditions for performance

12 TB SAS Enterprise Drive

The Seagate Exos X18 is a 12 TB internal hard drive with a 12 Gb/s SAS interface designed for enterprise storage arrays. It uses a helium-sealed design with side-sealing weld technology to reduce weight and power per terabyte. Digital environmental sensors monitor internal conditions for consistent operation. Seagate Secure features support fast, secure drive retirement.

Suited for Hyperscale and Cloud Deployments

This drive targets cloud data centres and massive scale-out environments that need high capacity per rack unit. The enhanced caching helps with large sequential transfers and low-latency access patterns. Buyers who need a SATA interface or capacities beyond 18 TB should look at other models. Desktop or workstation users without SAS infrastructure will not be able to connect it.

Standard 3.5-Inch SAS Installation

Installation follows normal 3.5-inch enterprise drive procedures: mount in a SAS backplane or carrier, attach power and data cables, then configure in the RAID controller or HBA. The helium seal is permanent and must not be breached. Common issues include using a SATA-only backplane, missing the 12 Gb/s cable rating, or neglecting to enable Seagate Secure in the controller before deployment.

Highlights

  • 12 TB SAS capacity for dense rack storage
  • Helium-sealed design reduces power per terabyte
  • 5M-hr MTBF rating for enterprise reliability
  • Seagate Secure enables fast drive retirement
  • Digital sensors monitor internal conditions for performance

Specifications

No published specifications for this item yet.

Questions about this item

What host adapter or controller do I need to connect this 12Gb/s SAS drive?

You need a SAS HBA or RAID controller that supports 12Gb/s SAS signalling and provides the matching SAS connector for the drive interface.

Will this helium-sealed 12 TB Exos X18 work in a chassis that currently runs 6Gb/s SAS drives?

Yes, the drive will negotiate down to 6Gb/s on a 6Gb/s backplane or HBA, though maximum throughput will be limited to the slower link speed.

How can I verify the drive is operating correctly after installation?

Check that the system BIOS or HBA utility detects the full 12 TB capacity at 12Gb/s link speed, then run a SMART short self-test and confirm zero reallocated sectors.

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