Drive comparison
ST12000NM000J vs WD122KRYZ
Seagate Exos X18 12TB and Western Digital WD Gold 12TB, compared using published manufacturer specifications.
Seagate
Exos X18 12TB
ST12000NM000J
SATA 6 Gb/s · 3.5-inch
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Full specifications & all listings →Western Digital
WD Gold 12TB
WD122KRYZ
SATA 6Gb/s · 3.5-inch
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Amazon US · New listing ↗ASIN B0DF93LR3N
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What differs between these models?
- Interface: ST12000NM000J lists SATA 6 Gb/s; WD122KRYZ lists SATA 6Gb/s.
- Cache (MB): ST12000NM000J lists 256; WD122KRYZ lists 512.
- Sustained transfer (up to MB/s): ST12000NM000J lists 270; WD122KRYZ lists 267.
A larger cache, higher RPM or higher advertised sequential speed alone does not establish which drive is better for your workload.
Specifications side by side
| Specification | ST12000NM000J | WD122KRYZ |
|---|---|---|
| Manufacturer | Seagate | Western Digital |
| Product family | Exos X18 | WD Gold |
| Model number | ST12000NM000J | WD122KRYZ |
| Capacity (TB) | 12 | 12 |
| RPM | 7200 | 7200 |
| Interface | SATA 6 Gb/s | SATA 6Gb/s |
| Cache (MB) | 256 | 512 |
| Form factor | 3.5-inch | 3.5-inch |
| Average idle power (W) | 4.4 | Not recorded |
| Power-on hours per year | 8760 | Not recorded |
| Manufacturer limited warranty | 5 years (eligible new drives) | 5 years (eligible new drives) |
| Sustained transfer (up to MB/s) | 270 | 267 |
| Recording | Not recorded | CMR |
| Workload rating (TB/year) | Not recorded | 550 |
| Logical sector size (bytes) | Not recorded | 512 |
| Physical sector size (bytes) | Not recorded | 4096 |
Compatibility and buying checks
- Compare new and renewed offers separately. The manufacturer specification does not guarantee the warranty or return policy of a marketplace seller.
Manufacturer sources
ST12000NM000J
Seagate Exos X18 manufacturer specifications ↗ · pages 3
Reviewed 2026-09-07. Published specifications; no independent benchmark or failure-rate claim.
WD122KRYZ
Western Digital WD Gold manufacturer datasheet ↗
Reviewed 2026-08-21. Published specifications; no independent benchmark or failure-rate claim.