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Thread: Grub has made windows hdd unbootable

  1. #11
    Join Date
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    Ubuntu

    Re: Grub has made windows hdd unbootable

    You show a newer UEFI system, but most Windows 7 installs were BIOS on MBR partitioned drives.
    Only about 2012 when Microsoft required vendors to install Windows 8 in UEFI mode to gpt drives did hardware and then a few Windows 7 installs were UEFI.

    Post this:
    sudo parted -l

    UEFI & BIOS are not compatible, once you start booting in one mode or the other from UEFI, you cannot switch modes. Or grub can only boot other installs in same boot mode.
    And grub only boots working Windows. That includes Windows must not be hibernated or need chkdsk.
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  2. #12
    Join Date
    Nov 2014
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    Moskow region
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    Ubuntu Studio

    Re: Grub has made windows hdd unbootable

    sudo parted -l
    Code:
    Модель: ATA WDC WD20EFRX-68E (scsi)
    Диск /dev/sdb: 2000GB
    Размер сектора (логич./физич.): 512B/4096B
    Таблица разделов: gpt
    Флаги диска: 
    
    Номер  Начало  Конец   Размер  Файловая система  Имя                   Флаги
     1     1049kB  538MB   537MB   fat32             EFI System Partition  загрузочный, esp
     2     538MB   210GB   210GB   ext4
     3     210GB   2000GB  1790GB  ntfs                                    msftdata
    
    Cant switch bootorder, like efibootmgr refuses to put winbootmgr first
    i1@MS-7850:~$ sudo efibootmgr -o 0, 1, F, 10, E, B, 2, 9
    Malformed BootOrder order0,
                                 ^
    i1@MS-7850:~$ sudo efibootmgr 
    BootCurrent: 0001
    Timeout: 5 seconds
    BootOrder: 0001,000F,0000,0010,000E,000B,0002,0009
    Boot0000* Windows Boot Manager
    Boot0001* ubuntu
    Boot0002* UEFI: Built-in EFI Shell 
    Boot0009* UEFI: JetFlashTranscend 8GB 1.00
    Boot000B* CD/DVD Drive 
    Boot000E* Hard Drive 
    Boot000F  ubuntu
    Boot0010  UEFI OS
    I can forse it boot windows one time with -n option it boot windows.
    Last edited by i12; May 10th, 2021 at 08:17 AM.

  3. #13
    Join Date
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    Ubuntu

    Re: Grub has made windows hdd unbootable

    Some require all 4 chars for efibootmgr -o command.
    And no space after comma.

    You do not have typical Windows install, but since you have Windows UEFI boot entry it looks like an UEFI install.
    Windows only installs & boots from gpt partitioned drives with UEFI.

    Typical UEFI/gpt Windows partitions:
    https://docs.microsoft.com/en-us/win...Configurations
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

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