The logic board interface is strictly PCIe/NVMe it is unable to support SATA drives. The M.2 interface was designed to support a few different protocols as you can see here.
[image|2848951]
Sadly, Apple’s custom interface does not offer what the M.2 interface offered.
There are no custom Apple slot adapter unlike a desktop PC with PCIe slots which offer a SATA interface.
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I do strongly recommend sticking with either Apples custom SSDs or going with OWC SSD which meets Apples specs. The adapters and M.2 drives people try to use may appear to work for a time, sadly they don’t hold up.
The logic board interface is strictly PCIe/NVMe it is unable to support SATA drives. The M.2 interface was designed to support a few different protocols as you can see here.
[image|2848951]
Sadly, Apple’s custom interface does not offer what the M.2 interface offered.
There are no custom Apple slot adapter unlike a desktop PC with PCIe slots which offer a SATA interface.