Verdict

These are comparable SSDs. The WDS400T2R0A 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.

MZ-V9P4T0
Samsung 990 PRO · 4TB · Desktop
$940 ($235.00/TB)
WDS400T2R0A
WD Red SA500 · 4TB · NAS
$800 ($200.00/TB)

Value at a glance

Price / TB
MZ-V9P4T0 $160.31
WDS400T2R0A $200.00
Endurance (TBW)
MZ-V9P4T0 2,400 TB
WDS400T2R0A 2,500 TB

Price history

US · cheapest per day

MZ-V9P4T0 $940 WDS400T2R0A $800
zoomed · drag to zoom
$1,078 $674 $269 Aug 2024 Jan 2025 Jun 2025 Nov 2025 Mar 2026 Aug 2026
MZ-V9P4T0 WDS400T2R0A
Capacity 4 TB 4 TB
Form factor M.2 2.5
Interface NVMe SATA
NAND type TLC TLC
Endurance (TBW) 2,400 TB 2,500 TB
DWPD - -
DRAM cache Yes Yes
Power-loss protection No No
Sustained write - -
Cost / TBW $0.267 $0.320
Price / TB $160.31 $200.00
Buy
$940
View at Amazon →
$800
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.

MZ-V9P4T0

No Backblaze failure data for this model.

WDS400T2R0A

No Backblaze failure data for this model.