Seagate · Enterprise
ST18000NM001D
Exos X20 18TB
12 Gb/s SAS · 3.5-inch
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Compare alternatives ↓As an Amazon Associate I earn from qualifying purchases.The Seagate ST18000NM001D is a 18TB Exos X20 hard drive for server and enterprise storage, using 12 Gb/s SAS in a 3.5-inch form factor.
Manufacturer specifications
| Model number | ST18000NM001D |
|---|---|
| Nominal capacity | 18 TB · 18000 GB |
| FIPS | No |
| Interface | 12 Gb/s SAS |
| Form factor | 3.5-inch |
| Manufacturer limited warranty | 5 years (eligible new drives) |
Source: Seagate Exos X20 manufacturer specifications. Reviewed 2026-09-07. Published specifications, not our benchmark results.
What the specifications mean
Before ordering
Match ST18000NM001D, 18TB and 12 Gb/s SAS against the selected offer. Check your system’s exact-model compatibility list and the seller’s warranty and return terms.
Amazon US listings
Exact model matches on Amazon.com. A verified ASIN identifies the product; it does not guarantee current stock. Check the selected variant, condition and seller.
No verified exact-model ASIN is linked yet. This does not establish whether the model is currently available. Compare the alternatives below and check their listings.
Same-capacity alternatives with Amazon US links
These models share the drive type, interface class and capacity. Compare their specifications and your system requirements before choosing a replacement.
Seagate · Exos X18
ST18000NM004J
18TB · SAS 12 Gb/s
Compare with ST18000NM001D →View on Amazon US ↗ASIN B08NCF8Z8Q · Check price and conditionSeagate · Exos X18
ST18000NM005J
18TB · SAS 12 Gb/s
Compare with ST18000NM001D →View on Amazon US ↗ASIN B098YCXY22 · Check price and conditionSeagate · Exos X20
ST18000NM000D
18TB · 12 Gb/s SAS
Compare with ST18000NM001D →View on Amazon US ↗ASIN B09MWKFG51 · Check price and conditionST18000NM001D questions answered
What connection does ST18000NM001D need?
ST18000NM001D uses 12 Gb/s SAS. It needs a compatible SAS controller or backplane; a standard motherboard SATA port cannot run it.
How much usable space does ST18000NM001D provide?
Its nominal capacity is 18000 GB, approximately 16763.8 GiB before formatting. The filesystem, reserved space and any RAID redundancy reduce usable capacity further.
What warranty is listed for ST18000NM001D?
Manufacturer specification: 5 years (eligible new drives). A renewed, used, OEM or imported offer can have different coverage. Check the serial number and seller terms before buying.