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i have a windows install on disk 1, and arch linux on disk 2, i use the default 100 MB windows boot partition on disk 1 for both windows boot manager as well as grub to boot linux (os prober failed to add windows to grub, but thats of no issue)

id like to somehow make a boot partition an disk 2 and put grub there (only grub, i dont want to change windows boot mgr), but i understand thats not as simple as creating an arbitrary partition and installing grub there

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    “thats not as simple as creating an arbitrary partition and installing grub there”—it actually pretty much is though. Just create a new EFI System Partition on the desired drive and you’re good.
    – Daniel B
    Commented Nov 11, 2022 at 10:45

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you can create a bootable partition by making it UEFI System Partiton type

for that you can use a tool like fdisk on linux

for this example ill be assumeing drive path /dev/sda

first to enter fdisk do

fdisk /dev/sda

then to create a new partition

n

then enter the size 500 MB is 100% enough

+500M

print out the partitions to know witch one to edit

p

then to set partiton type

t

then enter in the partition number

1

and finally to set the type to UEFI system

1
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