Drive comparison
ST4000DM004 vs WD4006FZBX
Seagate BarraCuda 4TB and Western Digital WD_BLACK 4TB, compared using published manufacturer specifications.
Seagate
BarraCuda 4TB
ST4000DM004
SATA 6 Gb/s · 3.5-inch
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Full specifications & all listings →Western Digital
WD_BLACK 4TB
WD4006FZBX
SATA 6Gb/s · 3.5-inch
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What differs between these models?
- Interface: ST4000DM004 lists SATA 6 Gb/s; WD4006FZBX lists SATA 6Gb/s.
- Recording: ST4000DM004 lists SMR; WD4006FZBX lists CMR.
- Manufacturer limited warranty: ST4000DM004 lists 2 years (eligible new drives); WD4006FZBX lists 5 years (eligible new drives).
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 | ST4000DM004 | WD4006FZBX |
|---|---|---|
| Manufacturer | Seagate | Western Digital |
| Product family | BarraCuda | WD_BLACK |
| Model number | ST4000DM004 | WD4006FZBX |
| Capacity (TB) | 4 | 4 |
| Interface | SATA 6 Gb/s | SATA 6Gb/s |
| Recording | SMR | CMR |
| Cache (MB) | 256 | 256 |
| Form factor | 3.5-inch | 3.5-inch |
| Load/unload cycles | 600000 | Not recorded |
| Power-on hours per year | 2400 | Not recorded |
| Workload rating (TB/year) | 55 | Not recorded |
| Manufacturer limited warranty | 2 years (eligible new drives) | 5 years (eligible new drives) |
| RPM | Not recorded | 7200 |
| Sustained transfer (up to MB/s) | Not recorded | 267 |
Compatibility and buying checks
- One or both drives use SMR recording. Check sustained-write and array requirements before choosing one for a NAS or a write-heavy workload.
- Compare new and renewed offers separately. The manufacturer specification does not guarantee the warranty or return policy of a marketplace seller.
Manufacturer sources
ST4000DM004
Seagate BarraCuda manufacturer specifications ↗ · pages 3
Reviewed 2026-09-07. Published specifications; no independent benchmark or failure-rate claim.
WD4006FZBX
Western Digital WD_BLACK manufacturer datasheet ↗
Reviewed 2026-08-21. Published specifications; no independent benchmark or failure-rate claim.