ST18000NM004J: Seagate Exos X18 18TB 7200RPM SAS 12Gb/s 512e 3.5-inch Enterprise Hard Drive
MPN: ST18000NM004J|By: Seagate
Starting from
$390
Indicative. Final pricing is confirmed with your quote.
In Stockships worldwide
Key specs
- Capacity
- 18TB
- Interface Standard
- 12Gb/s SAS
- Spindle Speed
- 7200 RPM
- Form Factor
- LFF
- Drive Width
- 3.5"
- Condition:
- New (authorized channel)
- Warranty:
- Full manufacturer warranty
Prefer your own inbox? Email us about this part
Bulk order? Request volume pricing
Authorized & warrantied
Sourced through authorized distribution, with the full manufacturer warranty.
Compatibility checked
Validated against your server platform before dispatch.
Delivery & lead time
Confirmed with your quote, including expedited freight where available.
Business & public sector
POs, net terms and volume pricing for qualified organizations, government and edu.
Product overview
The 18TB is the largest capacity in Seagate's Exos X18 range, which spans 12TB to 18TB across 4 capacity points. Helium-sealed nearline SAS capacity drive for bulk AI datasets and backup tiers.
It attaches over 12Gb/s SAS in the 3.5" LFF form factor. The platters spin at 7200 RPM behind a 256 MB cache.
Specifications
General
- Manufacturer part number
- ST18000NM004J
- Product Line
- Exos
- Product Series
- X18
- Product Type
- Hard Drive
- Drive Type
- Internal
Technical specifications
- Capacity
- 18TB
- Spindle Speed
- 7200 RPM
- Cache Storage
- 256 MB
- Disk Format
- 512e
Interfaces & connectivity
- Drive Interface
- SAS
- Interface Standard
- 12Gb/s SAS
Physical
- Drive Width
- 3.5"
- Form Factor
- LFF
Compatibility & compliance
- Compliance Standards
- RoHS, WEEE
Full published specifications for the Seagate Exos X18 18TB 7200RPM SAS 12Gb/s 512e 3.5-inch Enterprise Hard Drive, as supplied. Confirm your backplane presents 12Gb/s SAS and that the platform supports SAS before ordering: compatibility validation against your specific server model is part of every order.
Where the Exos X18 18TB is deployed
- Read-heavy tiers: dataset staging, repositories and boot volumes
- Capacity expansion into free 3.5" LFF bays
- Like-for-like replacement and spares holding for deployed fleets
- New build-outs standardised on 12Gb/s SAS
Who this part is for
- Storage teams growing a tier without changing the array behind it
- Integrators building to a customer storage specification
- Procurement buying drives on a purchase order against a build sheet
Questions buyers ask about this part
Will the 18TB Exos X18 fit my server?
This is a 3.5" LFF part on 12Gb/s SAS. It fits any bay wired for 12Gb/s SAS. Send us your server model and we will confirm backplane support, firmware level and any bracket or caddy required before you order. That check is part of every order we ship.
Should I take the 18TB or the 16TB?
They are the same drive line in a different capacity, with the same 12Gb/s SAS and 3.5" LFF. The 16TB gives you less capacity per bay at a lower unit cost. Where bays are the constraint (a full backplane, or a rack you cannot grow), the larger capacity is usually cheaper per usable terabyte once you count the chassis it saves. Ask us for both on one quote and compare.
Is this Seagate part genuine, and is the warranty intact?
Yes. We supply through authorized distribution only, so the part carries the full Seagate manufacturer warranty and its firmware update path stays supported. No grey-market stock, no re-labelled drives, no voided warranties.
Do you offer volume pricing and accept purchase orders?
The listed price is per unit and indicative; tiered pricing applies at quantity. We accept purchase orders from qualified businesses, government and defence agencies, and educational institutions, with net terms and consolidated invoicing available. Email the quantity you need and we will come back within 48 business hours.
Other capacities in the Seagate Exos X18 range
| Model | Part number | Availability | From |
|---|---|---|---|
| Seagate Exos X18 12TB 7200RPM SAS 12Gb/s 512e 3.5-inch Enterprise Hard Drive | N/A | In Stock | $280 |
| Seagate Exos X18 14TB 7200RPM SAS 12Gb/s 512e 3.5-inch Enterprise Hard Drive | N/A | In Stock | $320 |
| Seagate Exos X18 16TB 7200RPM SAS 12Gb/s 512e 3.5-inch Enterprise Hard Drive | N/A | In Stock | $360 |
Compare other Server Hard Drives we stock
| Model | Brand | Key spec | Availability | From |
|---|---|---|---|---|
| WD Ultrastar DC HC550 16TB 7200RPM SATA 6Gb/s 512e 3.5-inch Data Center Hard Drive | Western Digital | Capacity: 16TB | In Stock | $345 |
| Toshiba MG09 16TB 7200RPM SATA 6Gb/s 512e 3.5-inch Enterprise Hard Drive | Toshiba | Capacity: 16TB | In Stock | $335 |
| Hitachi HGST Ultrastar He10 8TB 7200 RPM 12Gb/s SAS 512e 3.5"-inch Enterprise Hard Drive | Hitachi | Capacity: 8TB | In Stock | $190 |
| Dell 4TB 7200RPM 12Gb/s SAS 512e 3.5-inch Hot-Plug Nearline PowerEdge Hard Drive | Dell Technologies | Capacity: 4TB | In Stock | $155 |
| HPE 4TB 7200RPM 12Gb/s SAS 512e 3.5-inch LFF Smart Carrier Midline ProLiant Hard Drive | HPE | Capacity: 4TB | In Stock | $155 |
| HP 2TB 7200RPM 6Gb/s SAS 512n 3.5-inch LFF Smart Carrier Midline ProLiant Gen8 Hard Drive | HP | Capacity: 2TB | In Stock | $80 |
Browse all Server Hard Drives or everything we stock from Seagate.
Specifying a system, not just the part?
Bulk capacity usually sits behind the flash tier that feeds a training cluster rather than under it.