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A desktop drive. It will work in a NAS the manufacturer certified it for, but it isn't rated for the continuous multi-drive duty a NAS bay imposes.

Capacity0.256 TB
Form factor2.5"
TypeSSD
InterfaceSATA
Interface speedSATA 6Gb/s
SeriesUltimate SU800
ClassDesktop
Sequential read560 MB/s
Sequential write520 MB/s
Endurance200 TBW
MTBF2000000 hours
Warranty3 years
Sector format512e
NAND typeTLC
DRAM cacheDRAM (size not stated)
ControllerSilicon Motion SM2258
Random read (4K)80000 IOPS
Random write (4K)85000 IOPS
Power, idle0.06 W
Operating temperature32 to 158 °F (0 to 70 °C)
Height (z-height)0.28 in (7 mm)
Weight1.7 oz (48 g)
ReleasedAug 2016
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Certified on 15 QNAP NAS models

Show all 15 QNAP models

The certified list above comes from QNAP's published Hardware Compatibility List. Certification is the manufacturer's statement, not a test performed here.