Seagate Exos X24 24TB
24TB
Model ST24000NM002H
- rpm
- 7,200
- MB cache
- 512
- TB/yr
- 550
- yr warranty
- 5
Exos X24 range
Should you buy the Exos X24 24 TB?
It's at home in a rack or a garage, where 7,200 rpm of spinning rust can whirr away all day without bothering anyone. Seagate backs it for five years, which is a long time in drive terms. CMR, thankfully. SMR and parity rebuilds don't get on.
Watch out for
At 7,200 rpm it's from the louder, warmer class. Fine in a cupboard, less fun on a desk. Its Backblaze record is the weak spot, with 3.03% AFR and even the bottom of the interval above the 1.40% median.
A 4-bay box full of these gives 72 TB after one drive's worth of parity.
Specifications
Each value links to the Seagate page or datasheet it came from, and "Not published" means the maker doesn't list it there.
| Capacity | 24 TB | source for Capacity (seagate.com, opens in new tab) |
|---|---|---|
| Spindle speed | 7,200 rpm | source for Spindle speed (seagate.com, opens in new tab) |
| Recording technology | CMR | source for Recording technology (seagate.com, opens in new tab) |
| Cache | 512 MB | source for Cache (seagate.com, opens in new tab) |
| Interface | SATA 6Gb/s | source for Interface (seagate.com, opens in new tab) |
| Form factor | 3.5in | source for Form factor (seagate.com, opens in new tab) |
| Workload rating | 550 TB/yr | source for Workload rating (seagate.com, opens in new tab) |
| MTBF / MTTF | 2,500,000 hours | source for MTBF / MTTF (seagate.com, opens in new tab) |
| Warranty | 5 years | source for Warranty (seagate.com, opens in new tab) |
Sources: seagate.com, seagate.com
Failure rate
Backblaze has 9,482 of them in service as ST24000NM002H. They've clocked up 9,975 drive-years between them and 302 have died, which puts the lifetime AFR at 3.03% (95% interval 2.70% to 3.39%, even the bottom of that is over the 1.40% median).
Lifetime9,975 drive-yrs 3.03%2.70–3.39
2025 Q37,199 drives 2.79%2.04–3.72
2025 Q48,328 drives 3.51%2.71–4.47
2026 Q19,323 drives 3.29%2.59–4.14
2026 Q29,482 drives 3.47%2.76–4.31
Median lifetime AFR across Backblaze drive models: 1.40%
Source: Backblaze Drive Stats, lifetime to 2026 Q2. Bear in mind that's data-centre use, which is a lot harder on a drive than a home NAS will ever be.
Seagate Exos X24 24TBST24000NM002H