Recording technology for the ST18000NM000J is not stated in any Seagate document we have checked (Seagate Exos X series product page, checked October 2026). The nearest model with a sourced answer is the ST20000VE002 (CMR).
ST - Seagate product prefix. (Seagate - product part-number and model-number decoding)18000 - Capacity field. 18000 denotes 18TB of formatted capacity. (Seagate - product part-number and model-number decoding)NM - Enterprise nearline family (Exos and its OEM equivalents). (Seagate - product part-number and model-number decoding)000 - we have not found a Seagate document defining this segmentJ - we have not found a Seagate document defining this segmentNearest model with a sourced answer: ST20000VE002 (Seagate SkyHawk AI 20TB, CMR). Listed for comparison only - two part numbers can use different recording methods, so its answer is not ST18000NM000J's.
Part-number reference: ST18000NM000J — decoded segments, sibling variants and the warranty check. Live rankings this model belongs to: every 18TB hard drive.
Checked, and it does not state this part number's recording technology: Seagate Exos X series product page · Checked
Without a manufacturer document we can cite, we cannot tell you whether this drive shingles its tracks, and that is the field that decides whether it belongs in an array. Treat it as unverified rather than as probably fine: if the drive is going into a NAS or anything that rebuilds, buy a model whose recording technology is sourced. If it is a single drive holding replaceable data, the recording technology is largely academic and this is a reasonable purchase either way.
| Model number | ST18000NM000J |
| Brand | Seagate |
| Family | Exos X |
| Capacity | 18TB |
| Form factor | 3.5" |
| Rotational speed | 7200 RPM |
| Cache | 256 MB |
| Recording technology | — |
| Workload rate | 550 TB/year |
| Warranty | 5 years |
| Status | Current |
| Replaced by | — |
A dash means we have not found a manufacturer document stating that field for this exact model. We leave it blank rather than filling it from a retailer listing.
We checked Seagate Exos X series product page and it does not state this part number's recording technology, so we do not state one. The nearest model with a sourced answer is the ST20000VE002, which is CMR.
The recording technology is unsourced, so we cannot clear it for arrays either way. What the spec table does say: a 550TB/year workload rating, which is NAS-or-higher class duty and a 5-year warranty. For an array, prefer a 18TB drive whose recording technology is sourced, such as the ST20000VE002 (CMR).