SATA Express

What is an mSATA SSD ? sata slot 2_1 slot as originally it was showing In BIOS: My BIOS is up-to date AHCI mode is selected Table of my Motherboard According to below sata slot If you want to use SATA hard drive using the SATA port without using the onboard controllerPCI Storage controller ,an optional part is

sata m2 slot The motherboard slot #1 shares bandwidth with a SATA Gbs port When the slot is populated, one SATA 6Gbs port is disabled problem