Designed for Select Synology NAS Models, 400GB Storage Capacity, M.2 22110 Form Factor, PCIe 3.0 x4 Interface, Up to 550 MB/s Sequential Write Speed, Up to 3100 MB/s Sequential Read Speed, 1.8 Million Hours MTBF, Endurance up to 500 Terabytes Written. Boost the performance of your compatible NAS with the 400GB SNV3500 NVMe M.2 22110 SSD from Synology which has been built for demanding cache deployments. It can handle tough caching workloads in 24/7 multi-user environments while its durable I/O performance boosts system responsiveness and speeds up the handling of frequently accessed data to provide a streamlined storage experience while minimizing service disruptions. This SSD has an overall capacity of 400GB an NVMe PCIe 3.0 x4 interface an M.2 22110 form factor sequential read speeds of up to 3100 MB/s sequential write speeds of up to 550 MB/s random reads of 205 000 IOPS and random writes of up to 40 000 IOPS. It also features an endurance of 500 TBW (terabytes written) 0.68 DWPD (drive writers per day) a 1.8 million-hour MTBF (mean time between failures) and an UBER (uncorrectable bit error rate) of 17 bits read. Please note that Synology's 400GB SNV3500 NVMe M.2 2280 SSD may be used directly in the M.2 slot of your compatible NAS or in an M.2 adapter card that fits into one of the PCIe slots on your NAS.