Interface: ST8000DM004 lists SATA 6 Gb/s; WD8002FZWX lists SATA 6Gb/s.
Recording: ST8000DM004 lists SMR; WD8002FZWX lists CMR.
Cache (MB): ST8000DM004 lists 256; WD8002FZWX lists 128.
Manufacturer limited warranty: ST8000DM004 lists 2 years (eligible new drives); WD8002FZWX lists 5 years (eligible new drives).

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 ST8000DM004 and WD8002FZWX
Specification	ST8000DM004	WD8002FZWX
Manufacturer	Seagate	Western Digital
Product family	BarraCuda	WD_BLACK
Model number	ST8000DM004	WD8002FZWX
Capacity (TB)	8	8
Interface	SATA 6 Gb/s	SATA 6Gb/s
Recording	SMR	CMR
Cache (MB)	256	128
Form factor	3.5-inch	3.5-inch
Load/unload cycles	600000	Not recorded
Power-on hours per year	2400	Not recorded
Workload rating (TB/year)	55	Not recorded
Manufacturer limited warranty	2 years (eligible new drives)	5 years (eligible new drives)
RPM	Not recorded	7200
Sustained transfer (up to MB/s)	Not recorded	238

Compatibility and buying checks

One or both drives use SMR recording. Check sustained-write and array requirements before choosing one for a NAS or a write-heavy workload.
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.