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Created November 21, 2021 10:05
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Installing Windows and Linux into the same partition
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idea.md

Installing Windows and Linux into the same partition

But WHY?

There was a reddit post about installing Arch on NTFS3 partition. Since Windows and Linux doesn't have directories with same names under the /(C:\), I thought it's possible, and turned out it was actually possible.
If you are not familiar to Linux, for example you've searched on Google "how to dualboot Linux and Windos" or brbrbr... you mustn't try this. This is not practical.

Pre-requirements

  • UEFI system
  • Any Linux live-boot CD/DVD/USB... with Linux kernel newer than 5.15
  • Windows installer USB

How-to

  1. Boot up Linux and create a EFI system partition. 1GB is enough (512MB may not be)
  2. Boot up Windows and normally install it. You may need to choose "Custom: Install Windows only" option.
  3. When finished, boot up Linux install USB and mount the NTFS partition Windows created. Note you need to specify -t ntfs3 on mount.
  4. Mount EFI partition and other needed ones (like swaps) and continue installing.
  5. Don't forget to "Add rootfstype=ntfs3 as kernel parameter"
  6. Done!

Known issues

  • ldconfig crashes for me, using Arch.
  • sometimes kernel panics on poweroff.
  • the pioneer says "the system will break after a few boots"
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