Verdict

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

HAT5300-12T
Synology Enterprise Series · 12TB · Enterprise
No DE price yet
ST12000NM000J
Seagate Exos X18 · 12TB · Enterprise
No DE price yet

Value at a glance

Capacity
HAT5300-12T 12 TB
ST12000NM000J 12 TB
HAT5300-12T ST12000NM000J
Capacity 12 TB 12 TB
Recording tech CMR CMR
RAID / NAS safe Yes Yes
Class Enterprise Enterprise
Spindle speed 7200 RPM 7200 RPM
Cache 256 MB 256 MB
Noise (idle) - -
Fill Helium Helium
Interface SATA SATA
Failure rate (AFR) - 0.41%
Price / TB - -
Buy No DE price yet No DE price yet

Highlighted cells mark the stronger spec for a NAS build. Failure rates from Backblaze Drive Stats where available; $/TB uses the cheapest live price. Buy links are Amazon affiliate.

HAT5300-12T

No Backblaze failure data for this model.

5yr warranty · 550 TB/yr rated · 2,500,000h MTBF

ST12000NM000J

0.41% AFR vs 1.34% fleet avg

95% CI 0.13-0.96%

1,087 drives · ~1,218 drive-years · 5 failures · Backblaze thru Q1 2026

5yr warranty · 550 TB/yr rated · 2,500,000h MTBF