Seagate Exos 36TB versus 32TB looks like a 12.5 percent capacity question. It is also a recording-architecture question because the ST36000NM001M 36TB profile is documented as host-managed SMR/ZAC, while the tracked Exos 32TB reference is a conventional CMR enterprise row.
The 36TB drive can reduce drive count and shelf count at 1PB scale. The 32TB drive is the safer conventional path for storage stacks that expect normal CMR behavior.
Choose Exos 36TB when host-managed SMR is already qualified and rack density is the binding constraint. Choose Exos 32TB CMR when broad compatibility, random-write behavior, conventional RAID/ZFS support or simpler spares matter more than the 12.5 percent raw capacity gain.
Use this as the procurement-level screen before looking at live price rows.
| Decision point | Exos 36TB | Exos 32TB |
|---|---|---|
| Architecture | SMR / ZAC host-managed Mozaic | CMR in tracked Exos 32TB row |
| Capacity | 36TB | 32TB |
| Capacity gain | +12.5% raw per drive | Baseline |
| Interface | SATA 6Gb/s | SATA 6Gb/s in tracked row |
| Cache | 1024MB | 512MB in tracked row |
| Best workload | Qualified bulk and sequential storage | Conventional enterprise storage |
| Main limitation | Host-managed SMR requirement | Lower slot density |
| Decision metric | System-level density economics | Compatibility and live $/TB |
Raw capacity is shown before parity, erasure coding, filesystem overhead and reserved free space.
| Scale | 36TB raw | 32TB raw | 36TB advantage |
|---|---|---|---|
| 8 drives | 288TB | 256TB | 32TB |
| 12 drives | 432TB | 384TB | 48TB |
| 24 drives | 864TB | 768TB | 96TB |
| 60 drives | 2160TB | 1920TB | 240TB |
| Drives for at least 1PB raw | 28 drives | 32 drives | 4 fewer drives |
No exact in-stock live row is currently matched for ST36000NM001M / ST32000NM004K. Relevant live alternatives are shown so the page does not collapse into an empty catalogue.
Live prices · updated every 4-5 hours · last checked 7 hr ago · one side may be unavailable in exact live stock
| Model | Capacity | Recording | RPM | Workload TB/yr | Warranty | $/TB | Price | |
|---|---|---|---|---|---|---|---|---|
| 24TB ST24000NM002HREFURB | 24TB | CMR | 7,200 | 550 | 5 yr | $29.17 | $700 | Buy |
| 24TB ST24000NM000H | 24TB | CMR | 7,200 | 550 | 5 yr | $58.37 | $1401 | Buy |
Workload rating is recorded per part number from Seagate's datasheet for that exact model, 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 | 100TB raw target | 500TB raw target | 1PB raw target |
|---|---|---|---|---|---|
| No exact in-stock row is available right now. Use the availability table for nearby live alternatives, then re-check the exact model before ordering. | |||||
Moving from 32TB to 36TB adds 4TB per bay. That is 32TB raw in eight drives, 96TB raw in a 24-drive shelf and 240TB raw in a 60-drive shelf. At 1PB raw, 36TB needs about four fewer drives than 32TB.
Those savings can cascade into fewer shelves, fewer ports, less cabling and lower rack footprint. That is the strongest reason to consider the 36TB model.
ST36000NM001M is not just a larger ST32000NM004K. The 36TB documentation used here describes SMR/ZAC host-managed behavior. The 32TB tracked Exos row is conventional CMR. That changes which storage stacks are valid.
For conventional environments, 32TB CMR can be the better engineering answer even if 36TB looks better on raw capacity. For SMR-aware environments, 36TB can materially improve system density.
Per-drive power is only part of the model. Fewer drives per PB can lower shelf-level watts and cooling demand, but each dense drive still has to be cooled continuously. Rebuilds and rebalancing also move more data per spindle.
Compare watts per protected TB, drive count per protected PB and the operational cost of qualification. A spreadsheet that uses only sticker price per raw TB is incomplete.
A 36TB drive has 4TB more raw decimal capacity, a 12.5 percent increase over 32TB.
At least 28 drives at 36TB, compared with at least 32 drives at 32TB.
Only if the target storage stack supports the 36TB model's host-managed SMR behavior and the density gain beats qualification cost.
No. Price per TB is the first screen, not the whole decision. 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.