Drive comparison
ST12000VNZ008 vs WD121KFBX
Seagate IronWolf 12TB and Western Digital WD Red Pro 12TB, compared using published manufacturer specifications.
Seagate
IronWolf 12TB
ST12000VNZ008
SATA 6 Gb/s · 3.5-inch
Check current Amazon price
Amazon US · New listing ↗ASIN B08147LZFD
Full specifications & all listings →
Western Digital
WD Red Pro 12TB
WD121KFBX
SATA 6Gb/s · 3.5-inch
$698.00
Amazon US · New listing ↗ASIN B07RTMPWD8 · as of Sep 12, 2026 11:48 UTC
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What differs between these models?
- Interface: ST12000VNZ008 lists SATA 6 Gb/s; WD121KFBX lists SATA 6Gb/s.
- Manufacturer limited warranty: ST12000VNZ008 lists 3 years (eligible new drives); WD121KFBX lists 5 years (eligible new drives).
- Sustained transfer (up to MB/s): ST12000VNZ008 lists 210; WD121KFBX lists 240.
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 | ST12000VNZ008 | WD121KFBX |
|---|---|---|
| Manufacturer | Seagate | Western Digital |
| Product family | IronWolf | WD Red Pro |
| Model number | ST12000VNZ008 | WD121KFBX |
| Capacity (TB) | 12 | 12 |
| RPM | 7200 | 7200 |
| Interface | SATA 6 Gb/s | SATA 6Gb/s |
| Recording | CMR | CMR |
| Cache (MB) | 256 | 256 |
| Form factor | 3.5-inch | 3.5-inch |
| Load/unload cycles | 600000 | Not recorded |
| Average idle power (W) | 5.1 | Not recorded |
| Power-on hours per year | 8760 | Not recorded |
| Average operating power (W) | 7.3 | Not recorded |
| Rotational vibration sensors | Yes | Not recorded |
| Manufacturer limited warranty | 3 years (eligible new drives) | 5 years (eligible new drives) |
| Sustained transfer (up to MB/s) | 210 | 240 |
| Workload rating (TB/year) | Not recorded | 550 |
| 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
ST12000VNZ008
Seagate IronWolf manufacturer specifications ↗ · pages 2
Reviewed 2026-09-07. Published specifications; no independent benchmark or failure-rate claim.
WD121KFBX
Western Digital WD Red Pro manufacturer datasheet ↗
Reviewed 2026-08-21. Published specifications; no independent benchmark or failure-rate claim.