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Silver 3.5-inch server hard drive with SAS interface

Seagate

Seagate Exos X18 18TB SAS 12Gb/s 7200RPM 3.5" HDD ST18000NM004J

SKU CH-Y2HS-5HKCY

High-capacity 18 TB server drive with SAS interface, 7200 RPM speed and 256 MB cache

  • Massive 18 TB capacity stores vast server datasets
  • 12 Gbps SAS interface moves data at enterprise speed
  • 7200 RPM spindle delivers consistent high-throughput performance
  • 256 MB cache accelerates frequent read and write operations
  • Helium-sealed design reduces drag for cooler, efficient operation

Enterprise SAS Drive

The Seagate Exos X18 is an 18 TB SAS hard drive built for server environments. Its helium-sealed design and 7200 RPM spindle target high-capacity storage arrays in data centres.

SAS 12 Gbps Interface Limit

The 12 Gbps SAS link caps sustained throughput at the interface level. Real-world transfer rates reach 270 MB/s, so the bus itself is not the bottleneck for sequential workloads.

18 TB Capacity and Headroom

The 256 MB cache absorbs burst I/O, while SuperParity protects data during rebuilds. The drive fills bulk-storage tiers comfortably but cannot match SSD latency for random, latency-sensitive workloads.

How it compares

Measured against everything we stock in Cable Locks & Laptop Extras, at today’s prices. Recalculated every night.

Price $581.99
Pricier than about 91% of the 8,808 comparable items (median $16.99).

Specifications

No published specifications for this item yet.

Questions about this item

Is the 18 TB model the only capacity available for this Exos X18 SAS drive?

The product listed is the 18 TB capacity with 256 MB cache and 7200 RPM speed.

What does the 270 read speed figure represent for this 18 TB SAS drive in a server?

The 270 read speed indicates the maximum sustained transfer rate in MB/s for the 7200 RPM helium-sealed drive.

How does the SAS 12 Gbps interface limit real-world throughput for this 3.5 inch HDD?

The 12 Gbps SAS interface caps the burst transfer rate, while sustained speeds reach 270 MB/s from the 7200 RPM platters.

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