Questions about dual booting Windows after installing Manjaro

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In UEFI boot, the easiest way for me is to:

  1. In a LiveISO, delete the /boot/efi partition for Manjaro via GParted
  2. Make the amount of room on your HDD/SSD you want for your Windows partition via GParted
  3. Boot into Windows ISO, and go to manual partitioning
  4. Select that empty partition, and Windows will create all of it’s own partitions including a boot partition
  5. Finish installation
  6. Boot into Manjaro Architect (or a regular LiveISO and use Architect, all of our LiveISOs have Architect)
  7. Mount the Windows boot partition to /boot/efi
  8. Go to System Rescue and to reinstall and fix your boot manager

Here are visual instructions that I made a bit ago for fixing/changing boot managers. This mentions refind but you can just select grub instead in System Rescue

Alternatively,

  1. Get a new HDD/SSD
  2. Delete the /boot/efi partition, then absorb the whole partition into Manjaro / (or /home or whatever you want)
  3. Boot into Windows ISO, go to manual partitioning
  4. Select that whole new HDD/SSD for Windows
  5. Continue from step 5 above

Or… you can skip the deleting the /boot/efi and just have 2 different boot partitions (which to me is a waste of space). Just make sure you set your Manjaro boot manager in your BIOS to be first to boot.

Some people like to unplug their Manjaro HDD/SSD before installing Windows, but… I never had any issues before.

I don’t have an answer for legacy boot.