Drive comparison
WD4006FZBX vs WD40EZAX
Western Digital WD_BLACK 4TB and Western Digital WD Blue 4TB, compared using published manufacturer specifications.
Western Digital
WD_BLACK 4TB
WD4006FZBX
SATA 6Gb/s · 3.5-inch
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WD Blue 4TB
WD40EZAX
SATA 6Gb/s · 3.5-inch
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Amazon US · Used / renewed listing ↗ASIN B0CX5LX5GJ
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What differs between these models?
- RPM: WD4006FZBX lists 7200; WD40EZAX lists 5400.
- Manufacturer limited warranty: WD4006FZBX lists 5 years (eligible new drives); WD40EZAX lists 2 years (eligible new drives).
- Sustained transfer (up to MB/s): WD4006FZBX lists 267; WD40EZAX 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 | WD4006FZBX | WD40EZAX |
|---|---|---|
| Manufacturer | Western Digital | Western Digital |
| Product family | WD_BLACK | WD Blue |
| Model number | WD4006FZBX | WD40EZAX |
| Capacity (TB) | 4 | 4 |
| RPM | 7200 | 5400 |
| Interface | SATA 6Gb/s | SATA 6Gb/s |
| Recording | CMR | CMR |
| Cache (MB) | 256 | 256 |
| Form factor | 3.5-inch | 3.5-inch |
| Manufacturer limited warranty | 5 years (eligible new drives) | 2 years (eligible new drives) |
| Sustained transfer (up to MB/s) | 267 | 180 |
| 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
WD4006FZBX
Western Digital WD_BLACK manufacturer datasheet ↗
Reviewed 2026-08-21. Published specifications; no independent benchmark or failure-rate claim.
WD40EZAX
Western Digital WD Blue manufacturer datasheet ↗
Reviewed 2026-08-21. Published specifications; no independent benchmark or failure-rate claim.