Seagate · Enterprise
ST20000NM003D
Exos X20 20TB
12 Gb/s SAS · 3.5-inch
Exact Amazon US product
$699.00
View on Amazon US ↗Used / renewed listing · ASIN B0CT1M6YXQ
Price as of Sep 12, 2026 10:53 UTC
The Seagate ST20000NM003D is a 20TB 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 | ST20000NM003D |
|---|---|
| Nominal capacity | 20 TB · 20000 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 ST20000NM003D, 20TB 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.
Amazon US · ASIN B0CT1M6YXQ
$699.00 · as of Sep 12, 2026 10:53 UTC
Amazon US · ASIN B0H7YRJQVF
$829.00 · as of Sep 12, 2026 11:43 UTC
Amazon US · ASIN B0B1S1GZPF
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 X20
ST20000NM002D
20TB · 12 Gb/s SAS
Compare with ST20000NM003D →View on Amazon US ↗ASIN B09MWKN3RN · Check price and conditionST20000NM003D questions answered
What connection does ST20000NM003D need?
ST20000NM003D 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 ST20000NM003D provide?
Its nominal capacity is 20000 GB, approximately 18626.5 GiB before formatting. The filesystem, reserved space and any RAID redundancy reduce usable capacity further.
What warranty is listed for ST20000NM003D?
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.