Verdict

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

WD4004FRYZ
WD Gold · 4TB · Enterprise
€324 (€80.98/TB)
WD4005FFBX
WD Red Pro · 4TB · NAS-Pro
€307 (€76.65/TB)

Value at a glance

Price / TB
WD4004FRYZ $35.07
WD4005FFBX $53.73
Capacity
WD4004FRYZ 4 TB
WD4005FFBX 4 TB
Noise (idle)
WD4004FRYZ 20 dB
WD4005FFBX 20 dB

Price history · DE, cheapest per day

WD4004FRYZ €324 WD4005FFBX €307
zoomed · drag to zoom
€392 €255 €119 Jul 2024 Dec 2024 May 2025 Oct 2025 Feb 2026 Jul 2026
WD4004FRYZ WD4005FFBX
Capacity 4 TB 4 TB
Recording tech CMR CMR
RAID / NAS safe Yes Yes
Class Enterprise NAS-Pro
Spindle speed 7200 RPM 7200 RPM
Cache 256 MB 256 MB
Noise (idle) 20 dB 20 dB
Fill Air Air
Interface SATA SATA
Failure rate (AFR) - -
Price / TB $35.07 $53.73
Buy
€324
View at Amazon →
€307
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.

WD4004FRYZ

No Backblaze failure data for this model.

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

WD4005FFBX

No Backblaze failure data for this model.

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