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Feb 2 at 15:42 comment added Ramhound If your disk is not discovered within the Windows installation environment it means, while it’s booted in UEFI, your disk is formatted as MBR or vice versa your booted in CSM and your disk is GPT. Windows 11 has all necessary drives to automatically detect your drive built-in so that’s the only explanation
Feb 2 at 15:28 comment added Tonny If you want to setup a dual-boot system with Windows, install Windows FIRST, starting with a really empty disk. Doing it the other way around is not recommended, because Windows fully expects to be the only OS on the system and will happily bork anything else while installing. Or refuse to install at all (as you just discovered).
Feb 2 at 15:27 comment added harrymc Please also explain your dual boot setup. If you have formatted the disk using diskpart, how did you do it?
Feb 2 at 15:15 history edited Kamil Maciorowski CC BY-SA 4.0
added information from OP's comment
Feb 2 at 15:11 comment added Simon Richter I'm using diskpart from the command shell available from the Windows installer (Shift-F10 in the installer screen). I am booted from the Windows 11 installation USB stick.
Feb 2 at 15:09 comment added harrymc In which OS are you using diskpart and how are you booting to it?
Feb 2 at 14:56 history asked Simon Richter CC BY-SA 4.0