Interface: ST4000DM000 lists SATA 6 Gb/s; WD4005FZBX lists SATA 6Gb/s.
Cache (MB): ST4000DM000 lists 64; WD4005FZBX lists 256.
Manufacturer limited warranty: ST4000DM000 lists 2 years (eligible new drives); WD4005FZBX lists 5 years (eligible new drives).
Sustained transfer (up to MB/s): ST4000DM000 lists 180; WD4005FZBX lists 202.

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 ST4000DM000 and WD4005FZBX
Specification	ST4000DM000	WD4005FZBX
Manufacturer	Seagate	Western Digital
Product family	Desktop HDD	WD_BLACK
Model number	ST4000DM000	WD4005FZBX
Capacity (TB)	4	4
Interface	SATA 6 Gb/s	SATA 6Gb/s
Cache (MB)	64	256
Form factor	3.5-inch	3.5-inch
Load/unload cycles	300000	Not recorded
Average idle power (W)	4	Not recorded
Power-on hours per year	2400	Not recorded
Workload rating (TB/year)	55	Not recorded
Average operating power (W)	5.6	Not recorded
Manufacturer limited warranty	2 years (eligible new drives)	5 years (eligible new drives)
Sustained transfer (up to MB/s)	180	202
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.