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Silver 3.5 inch hard drive with green circuit board visible

Seagate

Seagate Exos X20z ST20000NM001J 20TB 7200 RPM SATA 6.0Gb/s 3.5" internal hard drive

SKU CH-1E9M-BA87P

20 TB SATA 6.0 Gb/s 7200 RPM 3.5" host-managed SMR drive with 256 MB cache for sequential write-intensive workloads

  • Capacity20TB
  • RPM7200 RPM
  • InterfaceSATA 6.0Gb/s
  • Cache256MB
  • Recording TechnologySMR
  • Form Factor3.5"
  • Massive 20TB capacity stores vast bulk data
  • 7200 RPM spindle enables fast data access
  • SATA 6.0Gb/s interface provides high-speed connectivity
  • Host-managed SMR maximises storage efficiency
  • 256MB cache enhances data handling reliability

20 TB host-managed SMR drive

The Seagate Exos X20z ST20000NM001J is a 20 TB 3.5-inch internal hard drive spinning at 7200 RPM on a SATA 6.0 Gb/s interface. It uses host-managed shingled magnetic recording with a 256 MB cache and is built for continuous 24/7 operation in enterprise environments.

Suited for sequential write workloads

This drive fits data centres and bulk-storage arrays that can manage SMR zones directly in software. It is not for general desktop use, boot drives or random-access databases that need conventional magnetic recording. Builders without host-aware file systems or object-store layers should look elsewhere.

Standard 3.5-inch SATA installation

The drive mounts in any 3.5-inch bay with standard SATA data and power cables. No special drivers are required, but the host must implement zone management for the SMR layout; treating it as a regular block device will cause severe write stalls and premature wear. Zone-aware software is the only common pitfall.

Highlights

  • Massive 20TB capacity stores vast bulk data
  • 7200 RPM spindle enables fast data access
  • SATA 6.0Gb/s interface provides high-speed connectivity
  • Host-managed SMR maximises storage efficiency
  • 256MB cache enhances data handling reliability

Specifications

BrandSeagate
SeriesExos X20z
ModelST20000NM001J
Part Number2U6101-114
Capacity20TB
RPM7200 RPM
InterfaceSATA 6.0Gb/s
Cache256MB
Recording TechnologySMR
Form Factor3.5"
FeaturesHost-Managed SMR

Questions about this item

What host software or controller is required to manage the SMR zones on this Exos X20z drive?

The ST20000NM001J uses Host-Managed SMR technology, so the operating system or application must implement the ZBC/ZAC command set to control the sequential write zones.

Will this 20TB SMR drive work in a standard RAID controller that expects conventional drives?

Most hardware RAID controllers treat the drive as a normal block device and cannot issue the zone commands that Host-Managed SMR requires, so performance will degrade or the array may fail.

How can I verify the drive is correctly handling sequential write zones after installation?

Use a zone-aware tool such as libzbc or smartctl to report the zone type and write-pointer position; sequential zones should show an advancing write pointer after each write.

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