Technical Snapshot

The Seagate Exos X18 18TB SAS 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 270 MB/s over a SAS 12Gb/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 18TB of raw storage capacity, it is suited for file servers, RAID arrays, backup infrastructure, and high-capacity storage deployments. Part of the Seagate Exos X18 product line.

Use Case
Enterprise file servers, RAID arrays, data center storage
Compatibility
Standard 3.5" drive bay, SAS 12Gb/s interface
Category
Enterprise Hard Disk Drive — Seagate Exos X18
Seagate Exos X18 18TB SAS
Seagate HDD
Seagate Exos X18

Exos X18 18TB SAS

SAS 12Gb/s · 3.5" · 7,200 RPM · 256 MB · 18TB

Total raw storage capacity of the drive.
Capacity 18TB
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
MPNST18000NM004J
EAN8719706020480
CategoryHard Disk Drives
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Drive Specifications

Form Factor3.5"
InterfaceSAS 12Gb/s
RPM7,200 RPM
Cache256 MB
Sustained Transfer Rate270 MB/s
Workload Rating550 TB/year
MTBF2,500,000 hours
Power (Idle)5.0W
Power (Operating)8.5W

Full Specifications

Data sourced from Seagate product specifications
Drive
SeriesExos X18
Capacity18TB
Form Factor3.5"
InterfaceSAS 12Gb/s
RPM7,200 RPM
Cache256 MB
Performance
Sustained Transfer Rate270 MB/s
Workload Rating550 TB/year
Reliability
MTBF2,500,000 hours
Power (Idle)5.0W
Power (Operating)8.5W
Product
BrandSeagate
SegmentEnterprise
MPNST18000NM004J
EAN8719706020480
Physical
Package Dimensions49.53 x 29.21 x 21.59 cm

Support & Downloads

Seagate Exos X18 18TB SAS Firmware UpdateLatest firmware · Check Seagate support
Seagate Support →
Seagate Exos X18 18TB SAS DatasheetPDF · Technical specifications
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Frequently Asked Questions

Is the Exos X18 18TB SAS compatible with my server?

The Seagate Exos X18 18TB SAS uses a SAS 12Gb/s interface and requires a SAS-capable HBA or RAID controller. It is NOT compatible with standard SATA ports. SAS drives are designed for enterprise servers, SAN arrays, and high-performance storage subsystems.

Can I use the Exos X18 18TB SAS in a RAID array?

Yes. The Seagate Exos X18 18TB SAS 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 X18 18TB SAS?

The Seagate Exos X18 18TB SAS spins at 7,200 RPM with a 256 MB cache buffer, delivering sustained transfer rates up to 270 MB/s. This is optimal for sequential workloads like large file transfers and backup operations.

How much power does the Exos X18 18TB SAS consume?

The Seagate Exos X18 18TB SAS draws 8.5W under operating load and 5.0W at idle. For multi-drive configurations, factor these values into your power budget — a 12-drive array would consume approximately 102W under load.

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