I have a laptop that already has an ssd and a hdd I want to replace the hdd with another ssd . I have read that I need to change bios settings to ahci. I want to ask since my pc has already from factory an ssd with the os on it does this mean that ahci is already chosen or should I change the setting for the second drive also?
Why not look in the BIOS and see what it is set to at the moment.. I'm guessing ahci is on already.. If not you'll have to think about your current OS not booting if you turn achi on.