ST18000NM003J: Seagate Exos X18 18TB 7200 RPM SAS 12Gb/s 512e/4Kn 3.5-Inch Enterprise Hard Drive
Also listed as: 2TV203-002, Exos X18 18TB SAS, 2TV203-001 · made by Seagate
The Seagate Exos X18 18TB SAS (model ST18000NM003J) delivers dual-port 12Gb/s SAS performance and high areal density for petabyte-scale SAN arrays and enterprise shared JBODs. Reaching 270 MB/s sustained sequential rate and offering 2.5 million hours MTBF, it supports dual-path controller redundancy. When procuring used 18TB SAS drives, verify whether the drive was formatted with proprietary 520-byte sectors by an OEM SAN vendor, and reformat to 512-byte sectors using sg_format if necessary.
Specifications
| Part number | ST18000NM003J |
|---|---|
| Brand | Seagate |
| Made by | Seagate |
| Type | Hard drives |
| Other numbers | 2TV203-002, Exos X18 18TB SAS, 2TV203-001 |
| Status | current |
| Capacity (GB) | 18,000 |
| Interface | SAS 12Gb/s |
| Form factor | LFF 3.5in |
| Speed | 7200 rpm |
| Cache (GB) | 0.256 |
| Generation fit | Dual-port SAS enterprise server backplanes and SAN arrays |
About the ST18000NM003J
ST18000NM003J is Seagate's 18TB 7200 RPM dual-port SAS 12Gb/s enterprise hard drive in the Exos X18 series. Providing high areal density and dual-port SAS controller failover redundancy, it reaches sustained sequential rates up to 270 MB/s. It is widely deployed in petabyte-scale SAN storage systems, JBOD disk arrays, and enterprise backup repositories requiring continuous uptime during controller maintenance.
Compatibility
Compatible with enterprise server and storage backplanes wired for SAS. Connects to 12Gb/s and 6Gb/s SAS controllers. It will not function on SATA-only controllers or motherboard SATA headers. Requires standard 3.5-inch large-form-factor drive sleds.
How to identify a genuine unit
The label displays model code ST18000NM003J, series name Exos X18, capacity 18TB, and 12Gb/s SAS interface notation with laser-etched Seagate corporate branding. In hardware RAID BIOS, MegaRAID Storage Manager, and LSI diagnostic tools, it displays Seagate firmware and active dual-port SAS connectivity across both PHY channels.
Buying used
Request confirmation of power-on hours and verify that no uncorrectable read/write errors are logged. Confirm that the drive has standard 512-byte or 4096-byte sector formatting. Check that the gold SAS connector blades are free of corrosion or wear.
Reference prices (last 14 days, updated 2026-10-27)
New: USD 315 (1 sighting, Oct 2026)
Used: USD 200 (1 sighting, Oct 2026)
All sightings
| Seller | Condition | Price | Note | Seen |
|---|---|---|---|---|
| serversupply.com | new | USD 315 | 2026-10-27 | |
| ebay.com | used | USD 200 | 2026-10-27 |
Prices seen on public listings on the dates shown, before tax and shipping. Not an offer.
Fits these models
Equivalent part numbers
- Dell 400-BKTA Dell 18TB 7.2K SAS 3.5in Exos X18 HDD
FAQ
What interface does ST18000NM003J feature?
Dual-port 12Gb/s Serial Attached SCSI (SAS).
How can 520-byte formatted OEM drives be reformatted for standard servers?
Using Linux sg3_utils: sg_format --format --size=512 /dev/sgX.
Buying or selling ST18000NM003J?
New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.
Sources
- Seagate Exos X18 Product Manual, checked 2026-10-27