M.2
The M . 2 specification supports NVM Express ( NVMe ) as the logical device interface for M . 2 PCI Express SSDs , in addition to supporting legacy Advanced Host Controller Interface ( AHCI ) at the logical interface level . 
<triplet> M.2 <subj> SSDs <obj> use <triplet> M.2 <subj> SSDs <obj> use <triplet> Advanced Host Controller Interface <subj> NVM Express <obj> followed by