I’m planning to keep W11 and EOS dualboot for the immediate future in case there is anything on windows that I need that I’m forgetting to migrate over right now. When it comes time to remove windows permanently will there be any issues with just removing the partition and adjusting the bootloader to remove windows and leave just EOS that would likely just end up making me want to format and fresh install EOS again? Because if thats likely to be the case I’ll just need to suck it up now and lose anything I’ve forgotten about instead of bothering to go through the same process twice.
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Good to have you with us!
In short, no. If you’ve set the boot loader to be the primary option, - you can safely remove your windows partition from within Linux. Just do this after a reboot, not a shutdown, if you are in Windows, as that OS will use hybrid boot to lock access to the system. After that, you can clear down the boot loader options.
As always, back up your data, - it’s much less stress than the sense of cold dread of wondering what you’ve potentially lost while migrating! Good luck, and enjoy the journey. Welcome to freedom 
@shawntw
Welcome to the EndeavourOS forum. 
I hope you enjoy your time here.
Pudge
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Depending on what bootloader you have chosen, you would need to pay attention to what partitions you will be removing.
If you have chosen Grub, the Windows and EOS will be sharing the same ESP so you should take care not removing that partition.
If you have chosen systemd-boot (the default), then because of EOS’ size requirements, the installer should have created a new ESP where EOS boot files and kernels reside. In this case you can safely remove all partitions belonging to Windows.
In any case, if something goes wrong and you will have problem with booting your EOS, make sure to keep around your live EOS usb and study EOS’ wiki article on chrooting and repairing a non-bootable system.
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Welcome to our little community.
This is an interesting wrinkle, and I’ll be following because I also dual-boot Win11 & EnOS.
In my case, I have two functions that require I stay with Windows. But I’m playing with different VM solutions so hopefully…eventually…I can wipe the Win11 partitions and move 100% to EnOS and only spin up a VM when I need to use one of those two functions. Once I get there, I’ll need to move the ESP partition so I can expand the root and home partitions to fill the drive.
Honestly I wouldn’t dual boot. If your plan is to ditch windows then maybe get another drive an replace the windows drive. Unplug the Windows drive install EndeavourOS then if you need to go back you can just switch the drives. This will make it much easier to just delete everything on the windows drive and use it as maybe a /home drive if you are able to keep both drives in.
If you do have to share a drive between the two then it will more in line with what @cactux has explained.
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Welcome to the forum @shawntw 
the only time I dusted windows SSD off from it’s home under my bed, it was to make Webex work for employment things. even using it in the browser the audio is missing. and on my other distro as well.
Good to have WIN in case of emergency but it’s rare once you learn the terrain of foss/linux.
2 cents and Welcome!