Verdict

These are comparable SSDs. The ZP4000GM3A063 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.

WDS400T4X0E
WD Black SN7100 · 4TB · Desktop
£502 (£125.41/TB)
ZP4000GM3A063
Seagate FireCuda 530R · 4TB · Desktop
£845 (£211.25/TB)

Value at a glance

Price / TB
WDS400T4X0E $150.46
ZP4000GM3A063 $268.29
Endurance (TBW)
WDS400T4X0E 2,400 TB
ZP4000GM3A063 5,050 TB

Price history

UK · cheapest per day

WDS400T4X0E £502 ZP4000GM3A063 £845
zoomed · drag to zoom
£871 £534 £197 Nov 2024 Mar 2025 Aug 2025 Jan 2026 Jun 2026 Nov 2026
WDS400T4X0E ZP4000GM3A063
Capacity 4 TB 4 TB
Form factor M.2 M.2
Interface NVMe NVMe
NAND type TLC TLC
Endurance (TBW) 2,400 TB 5,050 TB
DWPD - -
DRAM cache No Yes
Power-loss protection No No
Sustained write - -
Cost / TBW $0.251 $0.213
Price / TB $150.46 $268.29
Buy
£502
View at Amazon →
£845
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.

WDS400T4X0E

No Backblaze failure data for this model.

ZP4000GM3A063

No Backblaze failure data for this model.