M2 Key E

2 SSDs: SATA and NVMe SATA uses an older interface with one designed around hard drives while NVMe is designed for flash memory

2 NVME SSDs with a notch is the strongest; from the compatibility, M 2

nvme slot is a new form of connectivity that allows a SSD to connect directly to the PCI-E bus rather than going through a SATA controller By

nvme 40 in 30 slot It is a type of PCIe slot drives can use a SATA or NVMe interface SATA ones will have two notches and NVMe will have one