Verdict

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

WD120EFBX
WD Red Plus · 12TB · NAS
€786 (€65.49/TB)
WD121KRYZ
WD Gold · 12TB · Enterprise
€654 (€54.49/TB)

Value at a glance

Price / TB
WD120EFBX $45.63
WD121KRYZ $38.70
Capacity
WD120EFBX 12 TB
WD121KRYZ 12 TB
Noise (idle)
WD120EFBX 24 dB
WD121KRYZ 20 dB

Price history · DE, cheapest per day

WD120EFBX €786 WD121KRYZ €654
zoomed · drag to zoom
€789 €554 €320 Jul 2024 Dec 2024 May 2025 Oct 2025 Feb 2026 Jul 2026
WD120EFBX WD121KRYZ
Capacity 12 TB 12 TB
Recording tech CMR CMR
RAID / NAS safe Yes Yes
Class NAS Enterprise
Spindle speed 7200 RPM 7200 RPM
Cache 256 MB 256 MB
Noise (idle) 24 dB 20 dB
Fill Helium Helium
Interface SATA SATA
Failure rate (AFR) - -
Price / TB $45.63 $38.70
Buy
€786
View at Amazon →
€654
View at Amazon →

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.

WD120EFBX

No Backblaze failure data for this model.

3yr warranty · 180 TB/yr rated · 1,000,000h MTBF

WD121KRYZ

No Backblaze failure data for this model.

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