Arch Linux

letuss004

Member

Registered: 2023-12-01

Posts: 1

How can I add Windows 10 to GRUB after delete default Windows EFI

Because of the limited partition size, I had to delete the default EFI partition and create a new one.
After creating it, I copied the EFI/Microsoft folder to the new partition, hoping it would boot.
However, it did not, so please help me add Windows to GRUB.

Disk Informations

sudo fdisk -l

Disk /dev/nvme0n1: 476.94 GiB, 512110190592 bytes, 1000215216 sectors
Disk model: INTEL SSDPEKNW512G8                     
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: A441B4C1-1BF0-4517-A6F8-90AC74265097

Device             Start        End   Sectors   Size Type
/dev/nvme0n1p1      2048    1085439   1083392   529M Windows recovery environment
/dev/nvme0n1p3   1290240    1323007     32768    16M Microsoft reserved
/dev/nvme0n1p4   1323008  303893708 302570701 144.3G Microsoft basic data
/dev/nvme0n1p5 303893712  674815459 370921748 176.9G Microsoft basic data
/dev/nvme0n1p6 674816000  675839999   1024000   500M Linux filesystem
/dev/nvme0n1p7 675840000 1000214527 324374528 154.7G Linux root verity (S390X)

/dev/nvme0n1p2 = the old EFI but I have deleted
/dev/nvme0n1p6 = the new one

sudo blkid /dev/nvme0n1p6
/dev/nvme0n1p6: SEC_TYPE="msdos" UUID="0F58-11E4" BLOCK_SIZE="512" TYPE="vfat" PARTUUID="7697fd3c-c5dc-4ad0-8c10-6467956b6e4e"

os-prober

sudo os-prober

return nothing even I set

GRUB_DISABLE_OS_PROBER=false

So, grub-mkconfig ran but do nothing.

Trying to add manual entry

menuentry 'Windows 10' {
    search --fs-uuid --no-floppy --set=root 0F58-11E4
    chainloader (${root})/EFI/Microsoft/Boot/bootmgfw.efi
}

lead me to advance start up

I have no idea what to do next

Last edited by letuss004 (2023-12-01 18:06:38)

kermit63

Member

Registered: 2018-07-04

Posts: 371

Re: How can I add Windows 10 to GRUB after delete default Windows EFI

The fact that you were able to get to the advanced start-up screen means the manual entry to grub has done its job. How to proceed from that screen is an entirely windows issue and beyond the scope of this forum. You may be better off asking in a windows-centric forum.

Because of limit partition size I have to delete default EFI partition then create a new one.

There's no need to delete the partition, You could've just resized it and probably not have to face this problem.

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Head_on_a_Stick

Member

From: The Wirral

Registered: 2014-02-20

Posts: 9,003

Website

Re: How can I add Windows 10 to GRUB after delete default Windows EFI

/dev/nvme0n1p6 674816000  675839999   1024000   500M Linux filesystem

Looks like the EFI system partition type is wrong.

Here's my ESP in fdisk:

/dev/nvme0n1p1     2048    1050623   1048576   512M EFI System

Use the "t" option ("change a partition type") and pick option "1" ("EFI System").

Note that the custom menuentry doesn't need the (${root}) bit, just the relative path is enough.

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