Drive comparison
ST4000NTZ01 vs WD40EFZZ
Seagate IronWolf Pro 4TB and Western Digital WD Red Plus 4TB, compared using published manufacturer specifications.
Seagate
IronWolf Pro 4TB
ST4000NTZ01
SATA 6 Gb/s · 3.5-inch
No verified exact-model Amazon listing yet.
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Western Digital
WD Red Plus 4TB
WD40EFZZ
SATA 6Gb/s · 3.5-inch
$194.99
Amazon US · New listing ↗ASIN B0G5YDXKS7 · as of Sep 12, 2026 10:59 UTC
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What differs between these models?
- RPM: ST4000NTZ01 lists 7200; WD40EFZZ lists 5400.
- Interface: ST4000NTZ01 lists SATA 6 Gb/s; WD40EFZZ lists SATA 6Gb/s.
- Cache (MB): ST4000NTZ01 lists 256; WD40EFZZ lists 128.
- Workload rating (TB/year): ST4000NTZ01 lists 550; WD40EFZZ lists 180.
- Manufacturer limited warranty: ST4000NTZ01 lists 5 years (eligible new drives); WD40EFZZ lists 3 years (eligible new drives).
- Sustained transfer (up to MB/s): ST4000NTZ01 lists 250; WD40EFZZ lists 180.
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 | ST4000NTZ01 | WD40EFZZ |
|---|---|---|
| Manufacturer | Seagate | Western Digital |
| Product family | IronWolf Pro | WD Red Plus |
| Model number | ST4000NTZ01 | WD40EFZZ |
| Capacity (TB) | 4 | 4 |
| RPM | 7200 | 5400 |
| Interface | SATA 6 Gb/s | SATA 6Gb/s |
| Recording | CMR | CMR |
| Cache (MB) | 256 | 128 |
| Form factor | 3.5-inch | 3.5-inch |
| Power-on hours per year | 8760 | Not recorded |
| Workload rating (TB/year) | 550 | 180 |
| Average operating power (W) | 8.7 | Not recorded |
| Rotational vibration sensors | Yes | Not recorded |
| Manufacturer limited warranty | 5 years (eligible new drives) | 3 years (eligible new drives) |
| Sustained transfer (up to MB/s) | 250 | 180 |
| NAS bays | Not recorded | 8 |
| 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
ST4000NTZ01
Seagate IronWolf Pro manufacturer specifications ↗ · pages 3
Reviewed 2026-09-07. Published specifications; no independent benchmark or failure-rate claim.
WD40EFZZ
Western Digital WD Red Plus manufacturer datasheet ↗
Reviewed 2026-08-21. Published specifications; no independent benchmark or failure-rate claim.