Drive comparison

WD6003FZBX vs WD6004FZWX

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

Western Digital

WD6004FZWX

SATA 6Gb/s · 3.5-inch

Check current Amazon price

ASIN B0CL4KJVJF

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Cache (MB): WD6003FZBX lists 256; WD6004FZWX lists 128.
Sustained transfer (up to MB/s): WD6003FZBX lists 227; WD6004FZWX lists 229.

A larger cache, higher RPM or higher advertised sequential speed alone does not establish which drive is better for your workload.

Show differences only

Manufacturer specifications for WD6003FZBX and WD6004FZWX
Specification	WD6003FZBX	WD6004FZWX
Manufacturer	Western Digital	Western Digital
Product family	WD_BLACK	WD_BLACK
Model number	WD6003FZBX	WD6004FZWX
Capacity (TB)	6	6
RPM	7200	7200
Interface	SATA 6Gb/s	SATA 6Gb/s
Recording	CMR	CMR
Cache (MB)	256	128
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	229

Compare new and renewed offers separately. The manufacturer specification does not guarantee the warranty or return policy of a marketplace seller.

Reviewed 2026-08-21. Published specifications; no independent benchmark or failure-rate claim.

Reviewed 2026-08-21. Published specifications; no independent benchmark or failure-rate claim.