Cache (MB): ST12000NT001 lists 256; WD120EFGX lists 512.
Workload rating (TB/year): ST12000NT001 lists 550; WD120EFGX lists 180.
Manufacturer limited warranty: ST12000NT001 lists 5 years (eligible new drives); WD120EFGX lists 3 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 ST12000NT001 and WD120EFGX
Specification	ST12000NT001	WD120EFGX
Manufacturer	Seagate	Western Digital
Product family	IronWolf Pro	WD Red Plus
Model number	ST12000NT001	WD120EFGX
Capacity (TB)	12	12
RPM	7200	7200
Interface	SATA 6 Gb/s	SATA 6 Gb/s
Recording	CMR	CMR
Cache (MB)	256	512
Form factor	3.5-inch	3.5-inch
Power-on hours per year	8760	Not recorded
Workload rating (TB/year)	550	180
Average operating power (W)	7.8	Not recorded
Rotational vibration sensors	Yes	Not recorded
Manufacturer limited warranty	5 years (eligible new drives)	3 years (eligible new drives)
Sustained transfer (up to MB/s)	270	Not recorded
NAS bays	Not recorded	Up to 8

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