Drive comparison
WD30EZAX vs WD30EZZX
Western Digital WD Blue 3TB and Western Digital WD Blue 3TB, compared using published manufacturer specifications.
Western Digital
WD Blue 3TB
WD30EZAX
SATA 6Gb/s · 3.5-inch
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WD Blue 3TB
WD30EZZX
SATA 6Gb/s · 3.5-inch
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What differs between these models?
- Cache (MB): WD30EZAX lists 256; WD30EZZX lists 128.
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 | WD30EZAX | WD30EZZX |
|---|---|---|
| Manufacturer | Western Digital | Western Digital |
| Product family | WD Blue | WD Blue |
| Model number | WD30EZAX | WD30EZZX |
| Capacity (TB) | 3 | 3 |
| RPM | 5400 | 5400 |
| Interface | SATA 6Gb/s | SATA 6Gb/s |
| Recording | CMR | CMR |
| Cache (MB) | 256 | 128 |
| Form factor | 3.5-inch | 3.5-inch |
| Physical sector size (bytes) | 4096 | 4096 |
| Manufacturer limited warranty | 2 years (eligible new drives) | 2 years (eligible new drives) |
| Sustained transfer (up to MB/s) | 180 | 180 |
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
WD30EZAX
Western Digital WD Blue manufacturer datasheet ↗
Reviewed 2026-08-21. Published specifications; no independent benchmark or failure-rate claim.
WD30EZZX
Western Digital WD Blue manufacturer datasheet ↗
Reviewed 2026-08-21. Published specifications; no independent benchmark or failure-rate claim.