Verdict

These two are closely matched CMR NAS drives of the same capacity - decide on price and warranty. Check the live $/TB above.

HDWR21C ST12000NM0008
Capacity 12 TB 12 TB
Recording tech CMR CMR
RAID / NAS safe Yes Yes
Class Desktop Enterprise
Spindle speed 7200 RPM 7200 RPM
Cache 256 MB 256 MB
Noise (idle) 20 dB -
Fill Helium Helium
Interface SATA SATA
Failure rate (AFR) - 2.58%
Price / TB - -

Highlighted cells mark the stronger spec for a NAS build. Failure rates from Backblaze Drive Stats where available; $/TB shows once live prices are wired.