Ssd and ahci settings?

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... show more 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?
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