We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
3.5 inch internal hard drive with silver metal casing and black circuit board visible on underside

Seagate

Seagate Exos X18 ST18000NM001J 18TB 7200 RPM 256MB SATA 6.0Gb/s 3.5" internal hard drive

SKU CH-0P3G-SN6QW MPN ST18000NM001J

An 18 TB enterprise hard drive with 7200 RPM, 256 MB cache and SATA 6.0 Gb/s interface

  • Total capacity18 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Flash memory typeHard Drive
  • Rotational speed7,200 RPM
  • Cache memory256 MB

Model SATA 6.0Gb/s

  • Market-leading 18TB capacity maximises petabytes per rack
  • Helium sealed design lowers power and weight per terabyte
  • 5M-hour MTBF rating backs enterprise-class reliability
  • 7200 RPM with 256MB cache delivers high-throughput performance
  • SATA 6.0Gb/s interface supports large-scale data transfers

Enterprise 18 TB SATA drive

The Seagate Exos X18 ST18000NM001J is a 3.5-inch internal hard drive built for enterprise storage arrays. It delivers 18 TB of capacity on a SATA 6.0 Gb/s interface, spins at 7 200 RPM and provides a 256 MB cache to sustain heavy sequential workloads in cloud and scale-out data centres.

Suited for hyperscale and archive workloads

This drive targets operators who need maximum terabytes per rack and a 2.5 M-hour MTBF rating for continuous operation. It is less appropriate for buyers who need the low latency of solid-state media or a smaller form factor for desktop enclosures.

18 TB capacity decision

The single specification that determines fit is the 18 TB capacity combined with the SATA 6.0 Gb/s interface; if the storage pool requires that density on a standard SATA backplane this model matches the requirement, otherwise a different capacity or interface must be chosen.

How it compares

Measured against everything we stock in 3.5-Inch Internal Desktop HDDs, at today’s prices. Recalculated every night.

Price $380.99
Pricier than about 89% of the 4,938 comparable items (median $107.99).
Total capacity 18 TB
Higher than about 93% of the 2,372 comparable items (median 2 TB).
Price per TB $21.17 per TB
Cheaper than about 92% of the 2,365 comparable items (median $62.21 per TB).

New to this? Paying with USDT: TRC-20 or ERC-20 — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameSeagate
Product lineExos X18
Model nameST18000NM001J
Total capacity18 TB
Recommended useFor Enterprise Storage
Performance
Rotational speed7,200 RPM
Mean latency4.16 ms
Storage
Flash memory typeHard Drive
Cache memory256 MB
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Max height26.1 mm
Maximum width101.85 mm
Maximum length147 mm
Shipping weight0.91 kg
Package size178 × 152 × 51 mm

Other versions of this model

1 more in the same range

Questions about this item

Do I need a SATA 6.0Gb/s port and a 3.5-inch drive bay to install the ST18000NM001J?

Yes, the drive uses a SATA 6.0Gb/s interface and a standard 3.5-inch form factor, so your system must provide a compatible SATA data port, a SATA power connector, and a 3.5-inch mounting bay.

Will the ST18000NM001J work alongside my older 3.5-inch SATA drives in the same array?

It will operate on the same SATA 6.0Gb/s bus as older 3.5-inch drives, but the 18TB capacity and 7200 RPM speed may change rebuild times and power draw compared with smaller, slower units.

How can I verify the Exos X18 is running at 7200 RPM after installation?

Check the drive’s reported rotational speed in your BIOS, UEFI, or a SMART monitoring tool; it should show 7200 RPM and a SATA 6.0Gb/s link rate.

More in 3.5-Inch Internal Desktop HDDs

Similar items