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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
SeriesM5 Pro
ClassDesktop
Cache512 MB
Sequential read540 MB/s
Sequential write460 MB/s
MTBF2400000 hours
Warranty5 years
NAND typeMLC
DRAM cache512MB DDR3
ControllerMarvell 88SS9187 Monet
EncryptionSED (unspecified)
Random read (4K)100000 IOPS
Random write (4K)86000 IOPS
Power, active0.25 W
Operating temperature32 to 158 °F (0 to 70 °C)
Power, standby/sleep0.3 W
Height (z-height)0.28 in (7 mm)
Weight2.5 oz (70 g)
Released2012
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Certified on 41 QNAP NAS models

Show all 41 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.