Technical Snapshot

The Seagate Exos X20 20TB SATA is an enterprise-class 3.5" hard disk drive designed for demanding server and data center workloads. Spinning at 7,200 RPM with a 256 MB cache buffer, it delivers sustained transfer rates up to 285 MB/s over a SATA 6Gb/s interface. The drive is rated for 550 TB/year workload with a 2,500,000 hours MTBF, backed by Seagate's enterprise reliability engineering. With 20TB of raw storage capacity, it is suited for file servers, RAID arrays, backup infrastructure, and high-capacity storage deployments. Part of the Seagate Exos X20 product line.

Use Case
Enterprise file servers, RAID arrays, data center storage
Compatibility
Standard 3.5" drive bay, SATA 6Gb/s interface
Category
Enterprise Hard Disk Drive — Seagate Exos X20
Seagate Exos X20 20TB SATA
Seagate HDD
Seagate Exos X20

Exos X20 20TB SATA

SATA 6Gb/s · 3.5" · 7,200 RPM · 256 MB · 20TB

Total raw storage capacity of the drive.
Capacity 20TB
Rotational speed of the disk platters. Higher RPM provides faster sequential and random I/O performance.
RPM 7,200
On-drive DRAM buffer for caching frequently accessed data and optimizing read/write operations.
Cache 256 MB
Annual workload rating. Enterprise drives support sustained 24/7 heavy use in server and NAS environments.
Workload 550 TB/year
MPNST20000NM002D
EAN8719706031509
CategoryHard Disk Drives
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Drive Specifications

Form Factor3.5"
InterfaceSATA 6Gb/s
RPM7,200 RPM
Cache256 MB
Sustained Transfer Rate285 MB/s
Workload Rating550 TB/year
MTBF2,500,000 hours
Power (Idle)5.3W
Power (Operating)8.8W

Full Specifications

Data sourced from Seagate product specifications
Drive
SeriesExos X20
Capacity20TB
Form Factor3.5"
InterfaceSATA 6Gb/s
RPM7,200 RPM
Cache256 MB
Performance
Sustained Transfer Rate285 MB/s
Workload Rating550 TB/year
Reliability
MTBF2,500,000 hours
Power (Idle)5.3W
Power (Operating)8.8W
Product
BrandSeagate
SegmentEnterprise
MPNST20000NM002D
EAN8719706031509
Physical
Package Dimensions49.53 x 29.21 x 21.59 cm

Support & Downloads

Seagate Exos X20 20TB SATA Firmware UpdateLatest firmware · Check Seagate support
Seagate Support →
Seagate Exos X20 20TB SATA DatasheetPDF · Technical specifications
Seagate Support →
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Frequently Asked Questions

Is the Exos X20 20TB SATA compatible with my NAS?

Yes, the Seagate Exos X20 20TB SATA uses a standard SATA 6Gb/s interface and 3.5" form factor, compatible with any NAS that accepts 3.5" SATA drives. It is widely supported by Synology, QNAP, TrueNAS, and Unraid systems. The 550 TB/year workload rating makes it suitable for always-on NAS environments.

Can I use the Exos X20 20TB SATA in a RAID array?

Yes. The Seagate Exos X20 20TB SATA is designed for RAID deployments. Its 550 TB/year workload rating and 2,500,000 hours MTBF ensure reliability in RAID 5, RAID 6, RAID 10, and ZFS configurations. Enterprise and NAS drives include error recovery features (TLER/ERC) for RAID controller compatibility.

What does the 550 TB/year workload rating mean?

The workload rating indicates the maximum annual data transfer the drive supports while maintaining stated reliability. 550 TB/year means the drive supports approximately 1.5 TB of data transfer per day, suitable for busy file servers and multi-user environments.

How fast is the Exos X20 20TB SATA?

The Seagate Exos X20 20TB SATA spins at 7,200 RPM with a 256 MB cache buffer, delivering sustained transfer rates up to 285 MB/s. This is optimal for sequential workloads like large file transfers and backup operations.

How much power does the Exos X20 20TB SATA consume?

The Seagate Exos X20 20TB SATA draws 8.8W under operating load and 5.3W at idle. For multi-drive configurations, factor these values into your power budget — a 12-drive array would consume approximately 106W under load.

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