Normal behavior? ssd uses disables use of a sata port

m 2 sata slot on motherboard
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SSDs for PCIe can be recognized by a cut-out — Key M Variants with two cut-outs on the right and left usually only

But cards with a B+M Key design can fit in either a B or an M host slot, since they have gaps for both Check your laptop or motherboard

m2 slot mainboard 2 Expander on my Creator X299 motherboard to install the new drive 2 ports individually like I can with the SATA ports I do have

m2 sata slot This video explains how to select which slot to use on a motherboard for the best