Exos M versus Exos X is a naming and procurement problem as much as a drive comparison. Seagate's current public pages use unified Exos messaging while support paths still expose Exos M, Exos X, Exos Xz and X/Mozaic records.
The practical lesson is simple: do not buy by family name alone. Exact model suffixes such as ST32000NM004K, ST25000NM000E, ST36000NM001M and ST36000NM003K can represent different support rows and recording assumptions.
Exos M is Seagate's Mozaic-era high-density enterprise family naming, while Exos X is the established enterprise nearline naming that also appears alongside newer Xz and support records. Use the exact model suffix and data sheet to decide CMR versus host-managed SMR, interface, sector format and compatibility.
Use this as the procurement-level screen before looking at live price rows.
| Decision point | Exos M | Exos X |
|---|---|---|
| What it represents | Mozaic-era high-density Exos support family | Established Exos enterprise nearline naming |
| Example support models | ST36000NM003K, ST32000NM003K | ST24000NM002H, ST32000NM004K, ST25000NM000E |
| Mozaic relationship | Central to current high-density positioning | Can appear beside Mozaic/Xz records depending on page |
| Recording behavior | Exact suffix decides | Exact suffix decides; Xz example is HM-SMR |
| Compatibility answer | Match exact manual and host support | Match exact manual and host support |
| Best use | High-density enterprise planning | Conventional and newer enterprise procurement by exact model |
| Main risk | Assuming every Exos M suffix behaves the same | Assuming every Exos X listing is conventional CMR |
| Procurement rule | Suffix first | Suffix first |
One exact live row is currently matched for ST24000NM002H, but both sides of ST36000NM003K / ST32000NM004K are not simultaneously in exact live stock. Relevant live alternatives are shown below for pricing context and should not be treated as exact OEM equivalents.
Live prices · updated about once a day · last checked 8 hr ago · one side may be unavailable; alternatives are not exact OEM replacements
| Model | Capacity | Recording | RPM | Workload TB/yr | Warranty | $/TB | Price | |
|---|---|---|---|---|---|---|---|---|
| 24TB ST24000NM002HREFURB This offer: sold by goHardDrive · Amazon says New / New · title says Renewed | 24TB | CMR | 7,200 | 550 | 5 yr | $33.29 | $799 | Buy on Amazon |
| 24TB ST24000NM000H This offer: sold by ITCP Technologies · Amazon says New / Unknown | 24TB | UNVERIFIED | 7,200 | 550 | 5 yr | $52.70 | $1265 | Buy on Amazon |
Workload rating is recorded per part number from the manufacturer's published data for that exact model where available, not blanketed across the line — two drives of the same capacity can differ because they are different generations. A dash means the figure is not stated for that listing. Recording technology comes from the manufacturer's published CMR/SMR list; a model absent from that list is shown as UNVERIFIED rather than guessed. Rows priced above 3× this line's in-stock median are flagged and excluded from the winner callout and from every median we compute.
This table is computed from live DatacenterDisk rows when an exact in-stock match exists. It is intentionally blank for unavailable models rather than filled with stale prices.
| Live model | Drive price | $/TB | 1 drive | 4 drives | 8 drives | 12 drives |
|---|---|---|---|---|---|---|
| ST24000NM002H | $799 | $33.29 | 24TB raw / $799 | 96TB raw / $3196 | 192TB raw / $6392 | 288TB raw / $9588 |
Mozaic is Seagate's high-density recording platform branding. It appears in Seagate's enterprise messaging around the newest large Exos capacities, including 32TB and 36TB context. That does not mean every visible Exos model with nearby capacity is interchangeable.
The most useful purchasing habit is to treat Mozaic as platform context and the full model number as the deployable identity. The support page, data sheet and product manual for that suffix decide compatibility.
Exos X has long been the recognizable enterprise nearline family. In current public records, Exos X and X/Mozaic pages can include both conventional high-capacity drives and Xz host-managed SMR examples such as ST25000NM000E.
That is why this page avoids a blanket claim that Exos X equals CMR. Some exact Exos X/Xz records need host-managed SMR support. Others, such as the tracked Exos 32TB CMR row used elsewhere on DatacenterDisk, fit conventional enterprise expectations.
Buyers replacing conventional enterprise drives should first filter for CMR exact models and supported interfaces. Buyers planning new dense bulk-storage infrastructure can evaluate Exos M and Mozaic-capacity options, but only with host requirements and zone behavior confirmed.
The family name is useful for discovery. It is not enough for a purchase order, a spare policy or a compatibility claim.
No. They appear as related Seagate enterprise naming paths, but exact model suffixes and data sheets decide architecture and compatibility.
Not by itself. The exact model documentation decides. For example, ST36000NM001M documentation used here describes host-managed SMR behavior.
No. Seagate enterprise capacities can span different recording and support records, so full model strings matter.
No. Price per TB is the first screen, not the whole decision - for the Seagate Exos M vs Exos X specifically: match recording method, interface, bay count, firmware support, warranty position and rebuild risk before accepting the cheapest row.
Specification claims on this page were checked against the pages below on 1 September 2026. Where a widely-repeated figure did not survive that check, we report what the source says now and say so in the text rather than repeating the familiar number.