Seagate · Exos X20
ST20000NM002C is Seagate Exos X20 20TB SATA-6G. 3 of its 5 segments are defined in Seagate's published documentation and decoded below; for the rest we have not found a defining document, and they are marked as such. No live listings right now - the reference material below still applies.
| Segment | What it means | Source |
|---|---|---|
| ST | Seagate product prefix. | Seagate |
| 20000 | Capacity field. 20000 denotes 20TB of formatted capacity. | Seagate |
| NM | Enterprise nearline family (Exos and its OEM equivalents). | Seagate |
| 002 | Not sourced - we have not found a Seagate document defining this segment. | Not sourced |
| C | Not sourced - we have not found a Seagate document defining this segment. | Not sourced |
We decode only what the manufacturer documents. There is a large body of community knowledge about the undocumented segments above, much of it probably right, and none of it published by Seagate - so it does not appear in this table. A reading nobody can check does not belong in a column headed “what it means”. Grammar reference: Seagate - product part-number and model-number decoding.
ST20000NM002C is Seagate Exos X20, a 20TB hard drive on SATA-6G.
We hold no live listing against this exact part number at the moment. 5 sibling part numbers are documented below - these are the numbers most often mistaken for this one, and the table marks which fields actually differ.
| Manufacturer | Seagate |
| Family | Exos X20 |
| Capacity | 20TB |
| Interface | SATA-6G |
| Product class | HDD |
These are the part numbers most often confused with ST20000NM002C. The differences below come from the same vendor documentation as the decode above - where a field is not documented, the row leaves it blank rather than guessing.
| Part number | Capacity | Interface | Format | |
|---|---|---|---|---|
| ST20000NM000D | 20TB | SAS-12G | 512e | reference |
| ST20000NM002D | 20TB | SATA-6G | 4Kn | reference |
| ST20000NM002H | 20TB | SATA-6G | in catalogue | |
| ST20000NM003D | 20TB | SAS-12G | in catalogue | |
| ST20000NM007D | 20TB | SATA-6G | in catalogue |
Amber cells differ from ST20000NM002C; grey cells match it.
No seller we track has ST20000NM002C in stock right now. That describes today's listings only - it says nothing about whether the model is discontinued. We are not going to fill this space with something else and call it a match. The decode, specifications and sibling table above are the reference answer for this part number and remain accurate whether or not anyone is selling one today. If you need the capacity rather than this specific part, the alternatives below are what is actually buyable.
A manufacturer part number does not imply a manufacturer warranty, and this is where part-number buyers lose the most money. OEM stock, integrator pulls and gray-market units all reach the market under the maker's own numbering. Retailers selling them sometimes state plainly that the manufacturer warranty is none; others simply do not mention it, which is not the same as it being covered.
Coverage attaches to the individual unit and its serial number, not to the part number. That means the only reliable answer comes from the manufacturer, about the specific drive you are being sold.
Ask the seller for the serial number before purchase, then enter it in Seagate warranty checker. We link the tool rather than showing a result here, because the answer depends on the individual drive and only Seagate can give it.
A seller warranty is a different promise from a different company. What each warranty tier actually covers · Verify on arrival
4 in-stock listings · same capacity and interface, any part number · ranked by live cost per tb, refreshed about once a day
| Drive | Capacity | Interface | Recording | Condition | $/TB | Price | |
|---|---|---|---|---|---|---|---|
| WD Ultrastar 20TB SATA | 20TB | SATA-6G | — | REFURB This offer: sold by goHardDrive · Amazon says New / Unknown · title says Renewed | $29.00 | $580 | Buy Now |
| Seagate Exos X20 20TB ST20000NM007D | 20TB | SATA-6G | CMR | REFURB This offer: sold by goHardDrive · Amazon says New / New · title says Renewed | $33.50 | $670 | Buy Now |
| WD Red Pro 20TB WD201KFGX WD201KFGX | 20TB | SATA-6G | CMR | REFURB This offer: sold by ALL4COMPUTERS ----- SIGNATURE REQUIRED ----- · Amazon says Used / Good · ALL4COMPUTERS ----- SIGNATURE REQUIRED -----'s note: 5 YEAR DEALER WARRANTY - 100% SATISFACTION GUARANTEED. | $40.00 | $800 | Buy Now |
| Seagate IronWolf Pro 20TB NAS ST20000NT001 | 20TB | SATA-6G | — | NEW This offer: sold by QuickDealStore · Amazon says New / Unknown | $41.50 | $830 | Buy Now |
Every 20TB drive we track, ranked by cost per terabyte.
ST20000NM002C is Seagate Exos X20 20TB SATA-6G. 3 of its 5 segments are defined in Seagate's own published documentation - the decode table on this page shows each one with the document that defines it. For the remaining segments we have not found a defining document, and we say so rather than repeating a community guess as fact.
The part number cannot tell you - coverage follows how the unit entered the market, not its designation. We track no live listing for ST20000NM002C right now, so there is no condition evidence to report either way. Check the specific serial with Seagate's own tool, linked in the warranty section on this page.
ST20000NM002C and ST20000NM000D are both in the Exos X20 range. They differ in interface: SATA-6G against SAS-12G, which decides whether the drive fits your controller. The variant table on this page lists every sibling we document with what differs.
We hold no live listing for this part number right now. That is the honest state rather than a broken page - this remains the reference answer for what ST20000NM002C is, how it decodes and which siblings it is confused with. The alternatives section below shows what is currently buyable at the same capacity.