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Switching RST to AHCI without losing data
(feddit.de)
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If you have access to an external drive as big or bigger than the laptop drive, boot SystemRescueCD and ddrescue it as a backup, just to be safe. I personally haven't had it actually wipe a drive, basically it's saying switching might render it unbootable if the right drivers aren't in place.
I always back up first just to be safe though, worst case I waste a little time.
I only got an old external USB2 drive. Backing up >1TB over that will take some time^^
Thanks for the suggestion though!