The MSATA and NGFF SSD cannot work at same time. The adapter only work for B-key or B/M-key socket NGFF SSD, cannot work for M-key NVME SSD. Insert both M.2 mSATA SSD on the PCBA,M.2 SATA SSD is the first priority. mSATA SSD won't work. Build in Mini PCI-e 52Pin Female connector,Build in M.2 (NGFF) B key Female connector. 2.5' SATA SSD Form Factor: 98 x 65.5mm,3A maximum output current.