An M.2 SSD will always be the first priority. When both an M.2 and mSATA device are connected the mSATA will not funciton.
Description
This is a M.2 new Specifications of SSD adapter card. It can be connected to use M.2(Ngff) and mSATA SSD to standard SATA interface. This card can be used for data transmission storage devices, and supports system boot.