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I installed a 500gb Samsung SSD in my MacBook with an Sintech adapter. Unfortunately the SSD ist not showing up if I try to install macos. I tried to check the terminal with diskutil list but there is no SSD too. What I have to do to fix this?

Sounds like faulty SSD, I recommend returning it (If possible) And getting an OWC SSD, It would be better because it doesn’t need an adapter.Part: OWC Aura Pro X2 SSDGuide: MacBook Pro 15" Retina Display Mid 2015 SSD Replacement