Windows 10: Win 10 "losing" boot partition - assigning wrong letter - can't boot

Discus and support Win 10 "losing" boot partition - assigning wrong letter - can't boot in Windows 10 Support to solve the problem; Hi all - New to this forum - 1st post My machine is a rather interesting triple-boot box (Win 10 Pro version 1903, Ubuntu Linux 18.04, and MacOS... Discussion in 'Windows 10 Support' started by Malibyte, Feb 7, 2020.

  1. Malibyte Win User

    Win 10 "losing" boot partition - assigning wrong letter - can't boot


    Hi all -

    New to this forum - 1st post

    My machine is a rather interesting triple-boot box (Win 10 Pro version 1903, Ubuntu Linux 18.04, and MacOS Catalina).
    Booting via UEFI. Boot manager is Clover, with GRUB secondary for Linux. Windows and Linux boot from one NvMe drive and MacOS from another. Each boot drive has its own EFI partition. There are also four other SSD drives and one spinner drive.

    All has been working fine for quite some time, through multiple OS updates and hardware tweaks and upgrades.

    However, recently Win10 has failed to boot, going directly to automatic repair, which fails; diagnosis fails.

    Linux and MacOS continue to boot normally.

    When I go into Command Prompt through Advanced options in recovery, DISKPART shows that the letter order of the partitions has been scrambled, with the Windows boot partition no longer being assigned C:. It's been assigned D: E: F: and others.

    Changing the drive letters via DISKPART does not solve the problem.
    BCDEDIT | find "osdevice" finds the correct partition.

    However, BOOTREC /rebuildbcd does NOT find any identified Windows installations (perhaps this is because the drives are GPT-partitioned rather than MBR??)

    CHKDSK /f on the boot partition -> clean.

    I restored the boot partition from a cloned copy made last week - which was working at the time - no difference, same behavior.

    Any thoughts? This is driving me nuts.

    Thanks in advance.
    Bob

    :)
     
    Malibyte, Feb 7, 2020
    #1
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Win 10 "losing" boot partition - assigning wrong letter - can't boot

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