RPM: WD2003FZEX lists 7200; WD20EARZ lists 5400.
Manufacturer limited warranty: WD2003FZEX lists 5 years (eligible new drives); WD20EARZ lists 2 years (eligible new drives).
Sustained transfer (up to MB/s): WD2003FZEX lists 164; WD20EARZ 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

Show differences only

Manufacturer specifications for WD2003FZEX and WD20EARZ
Specification	WD2003FZEX	WD20EARZ
Manufacturer	Western Digital	Western Digital
Product family	WD_BLACK	WD Blue
Model number	WD2003FZEX	WD20EARZ
Capacity (TB)	2	2
RPM	7200	5400
Interface	SATA 6Gb/s	SATA 6Gb/s
Recording	CMR	CMR
Cache (MB)	64	64
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)	164	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.

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.