Drive comparison
ST20000NM002D vs ST20000NM005H
Seagate Exos X20 20TB and Seagate Exos X24 20TB, compared using published manufacturer specifications.
Seagate
Exos X20 20TB
ST20000NM002D
12 Gb/s SAS · 3.5-inch
$1,017.99
Amazon US · Used / renewed listing ↗ASIN B09MWKN3RN · as of Sep 12, 2026 10:56 UTC
Full specifications & all listings →Seagate
Exos X24 20TB
ST20000NM005H
SAS 12 Gb/s · 3.5-inch
No verified exact-model Amazon listing yet.
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What differs between these models?
- Interface: ST20000NM002D lists 12 Gb/s SAS; ST20000NM005H lists SAS 12 Gb/s.
A larger cache, higher RPM or higher advertised sequential speed alone does not establish which drive is better for your workload.
Specifications side by side
| Specification | ST20000NM002D | ST20000NM005H |
|---|---|---|
| Manufacturer | Seagate | Seagate |
| Product family | Exos X20 | Exos X24 |
| Model number | ST20000NM002D | ST20000NM005H |
| Capacity (TB) | 20 | 20 |
| FIPS | No | Not recorded |
| Interface | 12 Gb/s SAS | SAS 12 Gb/s |
| Form factor | 3.5-inch | 3.5-inch |
| Manufacturer limited warranty | 5 years (eligible new drives) | 5 years (eligible new drives) |
| RPM | Not recorded | 7200 |
| Cache (MB) | Not recorded | 512 |
| Average idle power (W) | Not recorded | 6.5 |
| Power-on hours per year | Not recorded | 8760 |
| Sustained transfer (up to MB/s) | Not recorded | 285 |
Compatibility and buying checks
- A SAS drive requires a compatible SAS controller or backplane. A normal motherboard SATA port cannot operate a SAS drive.
- Compare new and renewed offers separately. The manufacturer specification does not guarantee the warranty or return policy of a marketplace seller.
Manufacturer sources
ST20000NM002D
Seagate Exos X20 manufacturer specifications ↗
Reviewed 2026-09-07. Published specifications; no independent benchmark or failure-rate claim.
ST20000NM005H
Seagate Exos X24 manufacturer specifications ↗ · pages 3
Reviewed 2026-09-07. Published specifications; no independent benchmark or failure-rate claim.