Verdict

These are comparable SSDs. The WDS200T2R0A 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.

WDS200T2R0A
WD Red SA500 · 2TB · NAS
$572 ($286.04/TB)
WDS200T2X0E
WD Black SN850X · 2TB · Desktop
$398 ($199.00/TB)

Value at a glance

Price / TB
WDS200T2R0A $224.10
WDS200T2X0E $199.00
Endurance (TBW)
WDS200T2R0A 1,300 TB
WDS200T2X0E 1,200 TB

Price history

US · cheapest per day

WDS200T2R0A $572 WDS200T2X0E $398
zoomed · drag to zoom
$856 $503 $150 Sep 2024 Feb 2025 Jul 2025 Nov 2025 Apr 2026 Sep 2026
WDS200T2R0A WDS200T2X0E
Capacity 2 TB 2 TB
Form factor 2.5 M.2
Interface SATA NVMe
NAND type TLC TLC
Endurance (TBW) 1,300 TB 1,200 TB
DWPD - -
DRAM cache Yes Yes
Power-loss protection No No
Sustained write - -
Cost / TBW $0.345 $0.332
Price / TB $224.10 $199.00
Buy
$572
View at Amazon →
$398
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.

WDS200T2R0A

No Backblaze failure data for this model.

WDS200T2X0E

No Backblaze failure data for this model.