Windows 10 not listed in boot options.

  1.    #1

    Windows 10 not listed in boot options.


    I am using an ASROCK motherboard. Yesterday I tried to install Ubuntu onto a second disk, later when I tried to boot into Windows 10 I couldn't get into Windows with GRUB nor the boot list. My windows disk was initially MBR which I converted to GPT before installing Ubuntu.

    I have access to Windows RE which i can boot into.

    I have tried bootrec /fixmbr and /fixboot, both returning a success but not fixing the issue.
    bootrec /scanOs returned Windows 10 on D:/ for some reason??
    chkdsk C:/ returned no errors.
    os-prober on Ubuntu returned nothing.

    I am able to access all my files so if worst comes to worst I can save what I want and wipe both drives however I don't want to do this unless it is necessary.

    *I'm not a Linux pro
      My ComputerSystem Spec

  2.    #2

    AkiraMiura said: View Post
    I am using an ASROCK motherboard. Yesterday I tried to install Ubuntu onto a second disk, later when I tried to boot into Windows 10 I couldn't get into Windows with GRUB nor the boot list. My windows disk was initially MBR which I converted to GPT before installing Ubuntu.

    I have access to Windows RE which i can boot into.

    I have tried bootrec /fixmbr and /fixboot, both returning a success but not fixing the issue.
    bootrec /scanOs returned Windows 10 on D:/ for some reason??
    chkdsk C:/ returned no errors.
    os-prober on Ubuntu returned nothing.

    I am able to access all my files so if worst comes to worst I can save what I want and wipe both drives however I don't want to do this unless it is necessary.

    *I'm not a Linux pro
    Hi and welcome to W10F. That's exact reason for advice to disconnect all other drives when installing OS. BOOT sectors got mixed up. Try those bootrec repairs with only windows drive connected.
      My ComputersSystem Spec

  3.    #3

    After I disconnected the second drive and used the bootrec commands then tried to boot into my Windows hard drive I got a black screen saying "Reboot and select proper boot device or insert boot media in selected boot device and press a key"
      My ComputerSystem Spec

  4.    #4

    That's because you converted the drive from MBR to GPT and it likely has an NTFS system partition that most computers can't boot from in UEFI mode.
      My ComputerSystem Spec

  5.    #5

    I have also been playing with Linux on a couple of systems and they are fun when it all goes wrong, IMHO that's one of the best way to learn.

    On a test rig and pen enabled tablet I installed Linux of all flavours after a Wndows installation. Grub is a bit of a pain when it goes wrong or when the partition is deleted ( to install a new distro ) I ran the same windows recovery commands and all is good to fix it. I have only used MBR with dual Win/linux experiments.

    So far my favourite is KDE Neon - it's really light and functional....

    I have only tried these on one ssd with partitions but would be interested to hear how this is fixed.

    All the best.

    [edit -- I do remember unchecking the fast boot in the power configuration in Win10.]

    You've probably already seen this, but, it might help.


    grub2 - Unable to boot into Windows after installing Ubuntu, how to fix? - Ask Ubuntu
    Last edited by farrellart; 4 Weeks Ago at 15:31.
      My ComputerSystem Spec

  6.    #6

    I added a GRUB menu entry for Windows 10 NTFS, when I tried to use it I get 2 errors:
    error: no such device: /EFI/Microsoft/Boot/bootmgfw.efi.
    error: unknown filesystem.

    I can't find an option for Legacy/UEFI in the BIOS to disable UEFI.

    I had an auto detected entry for Windows that errored out with:
    error: no such device: 44C0674EC06744F0.
    error: invalid signature.

    This option disappeared after I ran boot-repair on Ubuntu.

    Additionally, my second hard-drive doesn't appear in the BIOS (DEL) boot order however it does appear in the boot list selection (F11)
      My ComputerSystem Spec



  7. Posts : 26,477
    windows 10 professional version 1607 build 14393.969 64 bit
       #7

    Boot into windows RE > command prompt

    Find a camera or smartphone camera to take pictures and post images into the thread:

    bcdedit /enum
    bcdedit | find "osdevice"

    c:
    dir
    d:
    dir
    e:
    dir

    diskpart
    lis dis
    lis vol
    sel dis 0
    det dis
    lis par
    sel par 1
    det par
    sel par 2
    det par
    sel par 3
    det par
    sel par 4
    det par
    sel par 5
    det par
    sel dis 1
    det dis
    lis par
    sel par 1
    det par
    (take pictures)
    exit

    bootrec /fixmbr
    bootrec /fixboot
    bootrec /scanos
    bootrec /rebuildbcd

    How to Upload and Post Screenshots and Files at Ten Forums
    In case there are problems posting images please use share links (one drive, drop box, google drive)
      My ComputerSystem Spec

  8.    #8

    Sounds like you need to create a FAT32 EFI System partition to boot Windows from.
      My ComputerSystem Spec


 

Related Threads
Installation & Upgrade Add Safe Mode to Boot Options in Windows 10 in Tutorials
How to Add Safe Mode to Boot Options in Windows 10 If you have a problem with your PC, you can troubleshoot by starting it in safe mode. Safe mode starts Windows with a minimal set of drivers and services. If a problem doesn't reappear when you...
Boot partition listed twice in boot menu in Installation and Upgrade
I have windows 7, 8 and 10 dual boot. I decided to set 7 as the boot drive after having 10 and when I did, the boot menu and MSConfig both list 7 twice on the same partition and I cannot find Boot.ini. How do I get rid of the second listing of 7 in...
Solved solving about windows 10 boot options in Installation and Upgrade
In my desktop I have multibooted into windows 7 in C and then into windows 10 pro in D drive. after this, I installed windows 10 home in C drive. but now the boot menu has gone and windows 10 pro can't be opened. please inform me how may I have the...
Windows 8 and 10 boot options in Installation and Upgrade
I recently installed windows 10 on my hp envy dv6-7363cl. During the installation, I had a problem with the primary drive (MBR and UEFI compatibility issue in reference to the bootmedia). I was able to fix it but not before formatting the partition...
Upon starting windows (10) I'm constantly being shown the boot manager and the only OS I can choose from is windows 7. I am using W10 having upgraded from W7. Windows still boots but the startup times vary from 15sec to around 3min. Here is a...
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd
All times are GMT -5. The time now is 13:44.
Find Us