Drive comparison
WD6003FZBX vs WD6004FZBX
Western Digital WD_BLACK 6TB and Western Digital WD_BLACK 6TB, compared using published manufacturer specifications.
Western Digital
WD_BLACK 6TB
WD6003FZBX
SATA 6Gb/s · 3.5-inch
$457.00
Amazon US · Used / renewed listing ↗ASIN B07X64KK53 · as of Sep 12, 2026 04:46 UTC
Full specifications & all listings →
Western Digital
WD_BLACK 6TB
WD6004FZBX
SATA 6Gb/s · 3.5-inch
$314.99
Amazon US · New listing ↗ASIN B0D1TZTSJW · as of Sep 12, 2026 11:44 UTC
Full specifications & all listings →As an Amazon Associate I earn from qualifying purchases. Match the selected variant, condition and seller terms before ordering.
What differs between these models?
- Sustained transfer (up to MB/s): WD6003FZBX lists 227; WD6004FZBX lists 267.
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 | WD6003FZBX | WD6004FZBX |
|---|---|---|
| Manufacturer | Western Digital | Western Digital |
| Product family | WD_BLACK | WD_BLACK |
| Model number | WD6003FZBX | WD6004FZBX |
| Capacity (TB) | 6 | 6 |
| RPM | 7200 | 7200 |
| 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) | 5 years (eligible new drives) |
| Sustained transfer (up to MB/s) | 227 | 267 |
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
WD6003FZBX
Western Digital WD_BLACK manufacturer datasheet ↗
Reviewed 2026-08-21. Published specifications; no independent benchmark or failure-rate claim.
WD6004FZBX
Western Digital WD_BLACK manufacturer datasheet ↗
Reviewed 2026-08-21. Published specifications; no independent benchmark or failure-rate claim.