The recorded specifications do not establish a performance advantage for either model. Compare compatibility, the exact offer and the manufacturer documents below.

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 ST20000NM002D and ST20000NM003D
Specification	ST20000NM002D	ST20000NM003D
Manufacturer	Seagate	Seagate
Product family	Exos X20	Exos X20
Model number	ST20000NM002D	ST20000NM003D
Capacity (TB)	20	20
FIPS	No	No
Interface	12 Gb/s SAS	12 Gb/s SAS
Form factor	3.5-inch	3.5-inch
Manufacturer limited warranty	5 years (eligible new drives)	5 years (eligible new drives)

Compatibility and buying checks

A SAS drive requires a compatible SAS controller or backplane. A normal motherboard SATA port cannot operate a SAS drive.
Compare new and renewed offers separately. The manufacturer specification does not guarantee the warranty or return policy of a marketplace seller.

Manufacturer sources

ST20000NM002D

Seagate Exos X20 manufacturer specifications ↗

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

ST20000NM003D

Seagate Exos X20 manufacturer specifications ↗

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

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