Dual Boot System - RTM Partition No Longer Available

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  1. Posts : 29,078
    Windows 10 21H1 Build 19043.1023
       #1

    Dual Boot System - RTM Partition No Longer Available


    I created a dual boot system quite some time ago and all was well until . . .

    RTM partition was completely up-to-date. I had recently updated to Windows 10 Build 10251 on the Insider partition.

    I turned the machine off on Sunday January 31, left town, and returned Saturday February 6. All was well with the dual boot when I turned the system off before leaving. When I turned the system on last night, it booted directly into the Insider Partition. There seems to be no option to boot into the RTM partition.

    Help!
      My Computer


  2. Posts : 151
    Windows 10
       #2

    Does the RTM partition still exist? If it does, IMO, it's only missing from boot manager.
      My Computer


  3. Posts : 29,078
    Windows 10 21H1 Build 19043.1023
    Thread Starter
       #3

    Private said:
    Does the RTM partition still exist? If it does, IMO, it's only missing from boot manager.
    Yep, I checked and it's still there (D:\). And I know nothing about the boot manager.
      My Computer


  4. Posts : 151
    Windows 10
       #4

    Press Win+R, type in -> msconfig <- Enter. Click on Boot tab, does the RTM is listed there? If it does, look at the Timeout box, the reading should be 30 seconds.
      My Computer


  5. Posts : 5,452
    windows 10 Pro ver 21H2 build 19044.1348
       #5

    msconfig method should fix the issue.

    Just to add..................
    Control Panel > Power Options > left side, Require password on wakeup > Change settings that are currently unavailable >scroll down, UN-check "Turn on fast boot startup" > Save changes.
      My Computer


  6. Posts : 29,078
    Windows 10 21H1 Build 19043.1023
    Thread Starter
       #6

    Private said:
    Press Win+R, type in -> msconfig <- Enter. Click on Boot tab, does the RTM is listed there? If it does, look at the Timeout box, the reading should be 30 seconds.
    Thanks, Private; that worked!

    davidhk said:
    msconfig method should fix the issue.

    Just to add..................
    Control Panel > Power Options > left side, Require password on wakeup > Change settings that are currently unavailable >scroll down, UN-check "Turn on fast boot startup" > Save changes.
    Thanks, David. Private's solution worked. :) So, if I'm reading this correctly, fast boot could be the culprit? But, but, but, I like fast boot. :)
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  7. Posts : 29,078
    Windows 10 21H1 Build 19043.1023
    Thread Starter
       #7

    My next question would be, "Has anyone else with a dual boot system had this problem or is this one mine alone? Should I send feedback?"
      My Computer


  8. Posts : 5,452
    windows 10 Pro ver 21H2 build 19044.1348
       #8

    Wynona said:
    My next question would be, "Has anyone else with a dual boot system had this problem or is this one mine alone? Should I send feedback?"
    No, you are not alone.
    I have seen a few threads related to that.
    Personally I had the same issue. I dual booted Win 10 and Linux and it rebooted to Linus automatically.
    msconfig is the solution.
    Also under msconfig > Boot > I would set the OS I use most Set as default.
      My Computer


  9. Posts : 29,078
    Windows 10 21H1 Build 19043.1023
    Thread Starter
       #9

    davidhk said:
    No, you are not alone.
    I have seen a few threads related to that.
    Personally I had the same issue. I dual booted Win 10 and Linux and it rebooted to Linus automatically.
    msconfig is the solution.
    Thanks, David! Feedback imminent! :)

    davidhk said:
    Also under msconfig > Boot > I would set the OS I use most Set as default.
    FWIW, for me, the most recent "installation" remains the default boot OS. Since RTM was the first installed, and I haven't clean installed it since the "November Release", each new build that's clean installed becomes the default; if I don't choose one or the other, the default boots.
      My Computer


  10. Posts : 5,452
    windows 10 Pro ver 21H2 build 19044.1348
       #10

    Yes, the "latest" install becomes the default.
    That is why I mentioned about choosing which one you want as default. You might not want Insider build as default.
      My Computer


 

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