I have a Dell Inspiron 5458 (i5-5200u) which I just upgraded from 4GB RAM to 16 and from a 1TB HDD to 240GB SSD.
Everything went fine, booted into Manjaro installer fine, checked inxi -Fxxz in terminal and all my hardwares upgrades were detected.
The point is BIOS is not recognizing the new SSD. When I go into Settings -> General -> System Information -> Device Information it shows Primary Hard Drive = (none).
Anyone has a clue? Why the installer can detect and BIOS not?