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antoniovalos
n00b
Joined: 24 Mar 2023
Posts: 35
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 Posted: Sun Jun 23, 2024 5:02 pm Post subject: Dualboot with Windows 10, repair Windows 10 bootloader |
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I had 5 partitions in my drive, 1-3 I installed gentoo, and the 4,5 later created installing windows. everything was working fine, but I deleted the three fist partitions and recreated three partitions and installed gentoo without changing the 4 and 5 partitions.
After installing gentoo, without changing the windows partitions, Windows bootloader is broken. I can mount it and veryfy what is in it. How can I repair my windows 10 bootloader UEFI or adding it on grub bootloader option
*The 1-3 partitions were creating with different sizes in the new gentoo installation, but the sum of the sizes kept the same
The fdisk output now:
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Disk /dev/sdb: 223.57 GiB, 240057409536 bytes, 468862128 sectors
Disk model: ADATA SU650
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: 062826F2-437F-464E-AD58-F3EA3287FBC2
Device Start End Sectors Size Type
/dev/sdb1 2048 2099199 2097152 1G EFI System
/dev/sdb2 2099200 10487807 8388608 4G Linux swap
/dev/sdb3 10487808 234440703 223952896 106.8G Linux root (x86-64)
/dev/sdb4 234440704 234473471 32768 16M Microsoft reserved
/dev/sdb5 234473472 468860927 234387456 111.8G Microsoft basic data
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tux /home/antonio # fdisk -l /dev/sdb
Disk /dev/sdb: 223.57 GiB, 240057409536 bytes, 468862128 sectors
Disk model: ADATA SU650
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: 062826F2-437F-464E-AD58-F3EA3287FBC2
Device Start End Sectors Size Type
/dev/sdb1 2048 2099199 2097152 1G EFI System
/dev/sdb2 2099200 10487807 8388608 4G Linux swap
/dev/sdb3 10487808 234440703 223952896 106.8G Linux root (x86-64)
/dev/sdb4 234440704 234473471 32768 16M Microsoft reserved
/dev/sdb5 234473472 468860927 234387456 111.8G Microsoft basic data
tux /home/antonio # lsblk /dev/sdb -f
NAME FSTYPE FSVER LABEL UUID FSAVAIL FSUSE% MOUNTPOINTS
sdb
├─sdb1 vfat FAT32 1879-6EE3 1021.8M 0% /efi
├─sdb2 swap 1 9d621836-6ead-4ee7-8b76-49e51eb59d95 [SWAP]
├─sdb3 xfs 68386427-4cb3-4e72-80eb-4dc844d422c6 86.9G 19% /
├─sdb4
└─sdb5 ntfs C60E1CF30E1CDDED
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My gentoo installation is working fine now, how can I repair windows bootloader without reinstalling Windows? |
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Child_of_Sun_24
Guru
Joined: 28 Jul 2004
Posts: 590
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| Posted: Sun Jun 23, 2024 6:05 pm Post subject: |
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The problem is that you deleted the esp partiton (Efi System Partiton) which contains the Windows Bootloader.
You should repair it with booting from the Windows Installation Medium, then pressing Shift+F10 on the first screen to get a command prompt. Then you have to use the "bcdboot X:\windows" command to recreate the Windows Bootloader (X:\Windows should be the drive where Windows is mounted, can be any other drive letter).
After this Windows should boot again (Maybe you must change your bootloader back to grub in the Uefi-Firmware). |
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