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Thread: Windows not seen in grub

  1. #1
    Join Date
    Jun 2008
    Location
    Canada
    Posts
    453

    Default Windows not seen in grub

    hi,

    i have two ssd

    sda with tumbleweed
    sdb with windows 10

    boot loader: grub2 for efi
    probe foreign os is enabled
    osloader return nothing

    yast boot-loader don't see windows


    I'm able to access windows disk under suse.

    I can see:

    Windows
    Windows.old
    Windows10Upgrade

    it's a machine i bought (used) and installed tumbleweed yesterday.

    HTML Code:
    NAME                                                     FSTYPE        SIZE MOUNTPOINT                          LABEL
    sda                                                                  953.9G                                     
    ├─sda1                                                   vfat          156M /boot/efi                           
    ├─sda2                                                   btrfs         408M /boot                               
    └─sda3                                                   crypto_LUKS 953.3G                                     
      └─cr_ata-Samsung_SSD_850_PRO_1TB_S252NXAGA13358L-part3 LVM2_member 953.3G                                     
        ├─system-swap                                        swap            2G [SWAP]                              
        ├─system-root                                        btrfs        51.3G /                                   
        └─system-home                                        xfs           900G /home                               
    sdb                                                                  238.5G                                     
    ├─sdb1                                                   ntfs          500M                                     System Reserved
    ├─sdb2                                                   ntfs        117.9G /run/media/collinm/78E4D7CEE4D78CAE 
    └─sdb3                                                   ntfs        890.1M                                     
    HTML Code:
    /dev/sda1: SEC_TYPE="msdos" UUID="440D-FF8F" TYPE="vfat" PARTLABEL="primary" PARTUUID="7108279d-4930-4938-a677-1ff17d0352f8"
    /dev/sda2: UUID="24e991d1-861f-4758-9244-923857dd706b" UUID_SUB="59a130ab-e79c-4ad4-8f34-48ac0532883d" TYPE="btrfs" PARTLABEL="primary" PARTUUID="2856bfd2-ac22-44c8-bc22-77bdf22e05f2"
    /dev/sda3: UUID="e0eaf3e7-dc99-4ba1-ae96-a38f14370572" TYPE="crypto_LUKS" PARTLABEL="primary" PARTUUID="7633c784-e48c-46ce-8afd-e38052584d1f"
    /dev/sdb1: LABEL="System Reserved" UUID="CAB4D479B4D46A09" TYPE="ntfs" PARTUUID="0d538aa6-01"
    /dev/sdb2: UUID="78E4D7CEE4D78CAE" TYPE="ntfs" PARTUUID="0d538aa6-02"
    /dev/sdb3: UUID="7E50C86950C829AB" TYPE="ntfs" PARTUUID="0d538aa6-03"
    /dev/mapper/cr_ata-Samsung_SSD_850_PRO_1TB_S252NXAGA13358L-part3: UUID="WLYXJh-6s9N-GfLj-yRjd-gIwt-Zq2Y-2a6SwJ" TYPE="LVM2_member"
    /dev/mapper/system-swap: UUID="4ac61341-8279-4b46-9caa-dfbdc3f168e7" TYPE="swap"
    /dev/mapper/system-root: UUID="03d7931a-1729-4df4-a581-6fe41796afeb" UUID_SUB="9b4aa657-ac8a-4216-b45b-c8a702567958" TYPE="btrfs"
    /dev/mapper/system-home: UUID="145d1bb3-ee4b-42cb-9af7-9b832a5f989e" TYPE="xfs"
    www.laboiteaprog.com

  2. #2
    Join Date
    Aug 2010
    Location
    Chicago suburbs
    Posts
    15,673
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    Default Re: Windows not seen in grub

    Your drive "/dev/sdb" appears to be using legacy MBR partitioning. And that implies that Windows is set for MBR booting.

    You cannot mix and match. If you use UEFI for linux, the grub2 menu cannot boot using MBR legacy booting. It is best to use all UEFI or all MBR booting.

    Your choices:
    1. Work out how to manage with the current situation;
    2. Reinstall Windows for UEFI booting;
    3. Switch openSUSE to use MBR booting.


    Depending on the BIOS, there might be a key you can use during boot to indicate which system to boot. On some computers, that is F12.

    For the third option, you would probably have to reinstall Tumbleweed. You can't just convert it to MBR booting. Or, at least, you cannot easily convert. You can't install grub2 to boot from the MBR, because that requires a BIOS-boot partition (sometimes called a grub-boot partition) on a disk with GPT partitioning. And you cannot boot from the root partition, since that is encrypted. I'm not sure if you boot from "/boot", since that is using "btrfs".

    I guess you could try the third option and see what happens. Go into Yast bootloader. Change the boot loader from "grub2-efi" to plain "grub2". Tell it to boot from "/boot". If that gives an error, you are out of luck. If it does not give an error, make sure that there is a box checked to install generic boot code into the MBR. And then you have to tell your BIOS to use MBR booting.
    openSUSE Leap 15.3; KDE Plasma 5.18.6;

  3. #3
    Join Date
    Jun 2008
    Location
    Canada
    Posts
    453

    Default Re: Windows not seen in grub

    in the windows 10 entry when i clicked on it, get this error...

    error file /grub2/x86_64-efi/ntldr.mod not found
    error: no such deivce: 78e4d7cee4d78cae.
    error: can't find ocmmand ntldr

    think i will just use f12 option... it working anyway
    www.laboiteaprog.com

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