Verdict

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

WD161KFGX
WD Red Pro · 16TB · NAS-Pro
$705 ($44.06/TB)
WUH721816AL5204
WD Ultrastar DC HC550 · 16TB · Enterprise
No US price yet

Value at a glance

Capacity
WD161KFGX 16 TB
WUH721816AL5204 16 TB
Noise (idle)
WD161KFGX 20 dB
WUH721816AL5204 20 dB

Price history

US · cheapest per day

WD161KFGX $705
zoomed · drag to zoom
$705 $492 $280 Sep 2024 Feb 2025 Jul 2025 Nov 2025 Apr 2026 Sep 2026
WD161KFGX WUH721816AL5204
Capacity 16 TB 16 TB
Recording tech CMR CMR
RAID / NAS safe Yes Yes
Class NAS-Pro 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 $44.06 -
Buy
$705
View at Amazon →
No US 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.

WD161KFGX

No Backblaze failure data for this model.

5yr warranty · 300 TB/yr rated · 1,000,000h MTBF

WUH721816AL5204

No Backblaze failure data for this model.

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