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Ubuntu Disable RST while Windows Partitions Exist

Windows 11 already has the AHCI drivers by default.  There’s a number of articles that explain how to modify regex settings.  Usually this is not for the average user, or even an experienced one since if it doesn’t work, those settings would need to be reverted.   And there may not be an easy way to do this once the system can’t boot up, esp since windows will take actions, modifying files,  to try and boot the system.  This can have unintended consequences.

Regardless, backups are highly advised to a USB drive, that include all files and settings, before proceeding.

Disable RST in Advanced\SATA Configuration in BIOS by pressing F2 or DEL to get into BIOS first.  Reboot and check if every OS can boot up.  If they don’t, revert the BIOS settings and look at installing AHCI in Windows 10/11 to allow to switch to AHCI (It’s a boot driver after all).  The driver will come from your motherboard or laptop manufacturer.

Cheers,
HTH

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