Interface: ST1000DM003 lists SATA 6 Gb/s; WD1003FZEX lists SATA 6Gb/s.
Manufacturer limited warranty: ST1000DM003 lists 2 years (eligible new drives); WD1003FZEX lists 5 years (eligible new drives).
Sustained transfer (up to MB/s): ST1000DM003 lists 210; WD1003FZEX lists 150.

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 ST1000DM003 and WD1003FZEX
Specification	ST1000DM003	WD1003FZEX
Manufacturer	Seagate	Western Digital
Product family	Desktop HDD	WD_BLACK
Model number	ST1000DM003	WD1003FZEX
Capacity (TB)	1	1
Interface	SATA 6 Gb/s	SATA 6Gb/s
Cache (MB)	64	64
Form factor	3.5-inch	3.5-inch
Average idle power (W)	4.6	Not recorded
Power-on hours per year	2400	Not recorded
Workload rating (TB/year)	55	Not recorded
Average operating power (W)	5.3	Not recorded
Manufacturer limited warranty	2 years (eligible new drives)	5 years (eligible new drives)
Sustained transfer (up to MB/s)	210	150
RPM	Not recorded	7200
Recording	Not recorded	CMR

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 2026-09-07. Published specifications; no independent benchmark or failure-rate claim.

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