Verdict

These are comparable SSDs. The WDS200T4X0E is rated for the most write endurance, so it lasts longest in a NAS that sees steady writes; for light use any is fine and price decides.

WDS200T4B0E
WD Blue SN5000 · 2TB · Desktop
£309 (£154.50/TB)
WDS200T4X0E
WD Black SN7100 · 2TB · Desktop
£283 (£141.75/TB)

Value at a glance

Price / TB
WDS200T4B0E $150.00
WDS200T4X0E $162.97
Endurance (TBW)
WDS200T4B0E 900 TB
WDS200T4X0E 1,200 TB

Price history

UK · cheapest per day

WDS200T4B0E £309 WDS200T4X0E £283
zoomed · drag to zoom
£382 £237 £93 Nov 2024 Mar 2025 Aug 2025 Jan 2026 Jun 2026 Nov 2026
WDS200T4B0E WDS200T4X0E
Capacity 2 TB 2 TB
Form factor M.2 M.2
Interface NVMe NVMe
NAND type TLC TLC
Endurance (TBW) 900 TB 1,200 TB
DWPD - -
DRAM cache No No
Power-loss protection No No
Sustained write - -
Cost / TBW $0.333 $0.272
Price / TB $150.00 $162.97
Buy
£309
View at Amazon →
£283
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.

WDS200T4B0E

No Backblaze failure data for this model.

WDS200T4X0E

No Backblaze failure data for this model.