Verdict

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

WD161KRYZ
WD Gold · 16TB · Enterprise
€1,069 (€66.82/TB)
WUH721816AL5204
WD Ultrastar DC HC550 · 16TB · Enterprise
No ES price yet

Value at a glance

Capacity
WD161KRYZ 16 TB
WUH721816AL5204 16 TB
Noise (idle)
WD161KRYZ 20 dB
WUH721816AL5204 20 dB

Price history

ES · cheapest per day

WD161KRYZ €1,069
zoomed · drag to zoom
€1,126 €763 €401 Sep 2024 Feb 2025 Jul 2025 Nov 2025 Apr 2026 Sep 2026
WD161KRYZ WUH721816AL5204
Capacity 16 TB 16 TB
Recording tech CMR CMR
RAID / NAS safe Yes Yes
Class Enterprise Enterprise
Spindle speed 7200 RPM 7200 RPM
Cache 512 MB 512 MB
Noise (idle) 20 dB 20 dB
Fill Helium Helium
Interface SATA SAS
Failure rate (AFR) - -
Price / TB $53.13 -
Buy
€1,069
View at Amazon →
No ES 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.

WD161KRYZ

No Backblaze failure data for this model.

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

WUH721816AL5204

No Backblaze failure data for this model.

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