bcdedit and BIOS disk order, how do I setup multibooting?

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  1. shockwaveriderz
    Posts : 65
    Windows 10 Pro 1909 18363.959
       New #41

    I would keep the 3 UEFi: entries
    i would back my bcd store up with bcdedit /export "C:\BCDBKUP"
    I had about 8 extra firmware entries last night and deleted them.
    use the following 2 commands to help you see which is which:

    diskpart
    list volume
    list disk

    list volume

    Volume ### Ltr Label Fs Type Size Status Info
    ---------- --- ----------- ----- ---------- ------- --------- --------
    Volume 0 I RAW DVD-ROM 2048 B Healthy
    Volume 1 Recovery NTFS Partition 499 MB Healthy
    Volume 2 C Win10Pro NTFS Partition 855 GB Healthy Boot
    Volume 3 NTFS Partition 852 MB Healthy
    Volume 4 NTFS Partition 475 MB Healthy
    Volume 5 FAT32 Partition 99 MB Healthy System <-----U(Efi) System Partition (ESP)
    Volume 6 D DataStore NTFS Partition 848 GB Healthy
    Volume 7 R Recovery Pa NTFS Partition 9 GB Healthy
    Volume 8 Z RAMDisk NTFS Partition 1021 MB Healthy
    Volume 9 F MyPassportU NTFS Partition 931 GB Healthy
    Volume 10 G MyPassportU NTFS Partition 1862 GB Healthy
    Volume 11 ACRONIS RM FAT32 Partition 2047 MB Healthy Hidden
    Volume 12 H SX8200PRO NTFS Partition 430 GB Healthy

    DISKPART> list disk

    Disk ### Status Size Free Dyn Gpt
    -------- ------------- ------- ------- --- ---
    Disk 0 Online 953 GB 96 GB *
    Disk 1 Online 953 GB 95 GB *
    Disk 2 Online 1024 MB 1984 KB
    Disk 3 Online 931 GB 0 B *
    Disk 4 Online 1862 GB 1024 KB *
    Disk 5 Online 476 GB 44 GB *

    if you were to select a volume with select volume X, you can do a: detail volume

    wmic logicaldisk get deviceid, volumename, description

    >wmic logicaldisk get deviceid, volumename, description

    Description DeviceID VolumeName
    Local Fixed Disk C: Win10Pro
    Local Fixed Disk D: DataStore
    CD-ROM Disc E:
    Local Fixed Disk F: MyPassportUltra
    Local Fixed Disk G: MyPassportUltra2Tb
    Local Fixed Disk H: SX8200PRO
    CD-ROM Disc I:
    Local Fixed Disk R: Recovery Partition
    Local Fixed Disk Z: RAMDisk

    In EasyUEFI as you click on a boot entry, the corresponding partition will turn red, so this will tell which entry is pointing to which partition on which disk.

    bcdedit /enum /v
    Windows Boot Manager
    --------------------
    identifier {9dea862c-5cdd-4e70-acc1-f32b344d4795}
    device partition=\Device\HarddiskVolume3
    path \EFI\Microsoft\Boot\bootmgfw.efi
    description Windows Boot Manager
    locale en-US
    inherit {7ea2e1ac-2e61-4728-aaa3-896d9d0a9f0e}
    badmemoryaccess Yes
    default {0fc7b8bc-743a-11e9-964d-0c54157ab777}
    resumeobject {0fc7b8bb-743a-11e9-964d-0c54157ab777}
    displayorder {0fc7b8bc-743a-11e9-964d-0c54157ab777}
    {5491ac31-59ad-11e9-95da-0c54157ab777}
    {b3b69293-3e25-e2db-b89f-da816ab284e9}
    {711926ad-49b9-11e9-bed8-caa3aefe26d2}
    toolsdisplayorder {b2721d73-1db4-4c62-bf78-c548a880142d}
    timeout 10

    Windows Boot Loader
    -------------------
    identifier {0fc7b8bc-743a-11e9-964d-0c54157ab777}
    device partition=C:
    path \WINDOWS\system32\winload.efi
    description Windows 10
    locale en-US
    inherit {6efb52bf-1766-41db-a6b3-0ee5eff72bd7}
    recoverysequence {5ebfaa33-743a-11e9-a8a1-c1f4ca051f0f}
    displaymessageoverride Recovery
    recoveryenabled Yes
    badmemoryaccess Yes
    isolatedcontext Yes
    allowedinmemorysettings 0x15000075
    osdevice partition=C:
    systemroot \WINDOWS
    resumeobject {0fc7b8bb-743a-11e9-964d-0c54157ab777}
    nx OptIn
    bootmenupolicy Standard
    hypervisorlaunchtype Off
    quietboot No
    bootlog No
    sos No

    Notice the Bootmgr current guid entry is :

    default {0fc7b8bc-743a-11e9-964d-0c54157ab777}

    Notice that the Bootmgr guid in displayorder is this:

    displayorder {0fc7b8bc-743a-11e9-964d-0c54157ab777} <-----This guid is the same as the guid in the first bootloader entry and displayorder=boot menu order

    identifier {0fc7b8bc-743a-11e9-964d-0c54157ab777}

    This is your {default} boot entry that will boot first. All 3 will be the same......

    any bootloader or firmware boot entries that don't have that guid

    bcdedit and BIOS disk order, how do I setup multibooting?-msconfig.jpg
    Last edited by shockwaveriderz; 11 Aug 2019 at 01:41.
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  3. dictum
    Posts : 521
    Microsoft Windows 10 Home 64-bit 18363 Multiprocessor Free
    Thread Starter
       New #42

    ​bcdedit and BIOS disk order, how do I setup multibooting?-image.png
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  4. dictum
    Posts : 521
    Microsoft Windows 10 Home 64-bit 18363 Multiprocessor Free
    Thread Starter
       New #43



    In EasyUEFI as you click on a boot entry, the corresponding partition will turn red, so this will tell which entry is pointing to which partition on which disk.
    is that in the paid version? I don't see that in my free (trial) version.
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  6. shockwaveriderz
    Posts : 65
    Windows 10 Pro 1909 18363.959
       New #44

    dictum said:
    is that in the paid version? I don't see that in my free (trial) version.
    bcdedit and BIOS disk order, how do I setup multibooting?-easyuefi.jpg
    it's the trial version

    - - - Updated - - -

    I
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  7. SIW2
    Posts : 4,588
    several
       New #45

    two little red lines - you need to look hard.
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  8. PiKo
    Posts : 706
    W10
       New #46

    There might be problems with dual-booting when secure boot is enabled. Possible cause?
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  9. dictum
    Posts : 521
    Microsoft Windows 10 Home 64-bit 18363 Multiprocessor Free
    Thread Starter
       New #47

    wow, they could not have made it more hidden than this. I did see the very thin red lines around the EFI partition.

    Out of the 5 "windows boot manager" entries, I see only 2 that highlight the lines and 3 don't do anything. Is it safe to delete them? Does that mean they are the bogus entries?

    The first two in this pic highlight red lines and the others don't.

    bcdedit and BIOS disk order, how do I setup multibooting?-image.png


    they correspond, respectively, to these 2 disks:


    bcdedit and BIOS disk order, how do I setup multibooting?-image.png

    basically #3,4 and 5 don't highlight in red. You can see #5 says disabled.
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  10. dictum
    Posts : 521
    Microsoft Windows 10 Home 64-bit 18363 Multiprocessor Free
    Thread Starter
       New #48

    Plus, I cannot correlate the GPT partition GUID to anything, it does not show up in bcdedit.
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  12. dictum
    Posts : 521
    Microsoft Windows 10 Home 64-bit 18363 Multiprocessor Free
    Thread Starter
       New #49

    PiKo said:
    There might be problems with dual-booting when secure boot is enabled. Possible cause?
    checked off the list a long time ago.. disabled.
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  13. dictum
    Posts : 521
    Microsoft Windows 10 Home 64-bit 18363 Multiprocessor Free
    Thread Starter
       New #50

    How do I know it's safe to delete an entry? I am deeply concerned I will make my machine unbootable.

    And how about the bcfg command, would that be helpful?


    • The EFI version 2 shell provides a command called bcfg that can do the job. You'd need to do bcfg boot dump -b to see the entries, then bcfg boot rm # to delete entry number # -- # must be the number associated with whatever entry you want to remove.
    • In Linux, efibootmgr can do the job: Type efibootmgr or efibootmgr -v to see the entries, then do efibootmgr -b # -B to delete entry #. (You must type these commands as root or using sudo.)
    • In Windows, the EasyUEFI tool should be able to handle the job, although I've only toyed with it briefly, so I can't give detailed instructions.

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