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  1.    19 Jan 2018 #11

    Kbird said: View Post
    When I have seen this message before , it was a Bios Post message not a BSOD and it was because an Update had screwed up the Order of the Boot Devices in the Bios and it was trying to boot off D:\ instead of C:\ when I went into the Bios to check the Boot Order, so I set the 1st device back to Windows Boot Manager and all was Well.

    I can confirm that as well. I've paused the updates for now until February or something and all is well now. So I guess problem solved. Thank you all for help! :)
      My ComputerSystem Spec

  2.    21 Jan 2018 #12

    Stop that

    zablablukas said: View Post
    Hello! I've just tried turning on my PC and it shows me a BSOD saying INACCESSIBLE BOOT DEVICE. Yesterday everything was fine. I turned it off normally like always. I haven't updated any drivers either and there are no external drives or USBs connected. I liked for some solutions but none worked. I tried booting into safe mode (got the same error), I checked if my SATA options werr on AHCI (which they were). What do I do? I don't want to lose all my data!
    If you did not format anything yet, try this solution:

    Inaccessible Boot Device nach Update bei Windows 10 - die IT werkstatt Kiel

    If you dont understand german and google translator wont help you:

    you have to recover the registry backup from /windows/system32/config/regback to /windows/system32/config and rename the reg files. Before that, do a backup at least from /winsows/system32/config
      My ComputerSystem Spec

  3. Posts : 22,637
    windows 10 professional version 1607 build 14393.969 64 bit
       21 Jan 2018 #13

    When the computer is powered on now what do you see and hear?

    Use the windows 10 iso > windows advanced troubleshooting menu > command prompt
    Use a camera or smart phone camera to take pictures and post images into the thread:
    1) diskpart
    2) list disk
    3) select disk 0
    4) list partition
    5) exit
    6) c: dir
    7) d: dir
      My ComputerSystem Spec

  4.    14 Mar 2018 #14


    after regular update, my PC will not start, all I get is INACCESSIBLE BOOT DEVICE Error and DSOD. I can still access windows advanced troubleshooting menu > command prompt and I have been trying and trying. I have also managed to update the BIOS but no luck. I have followed tutorial from zbook, post 2. Since in step 14 I had osdevice partition=F, I typed chkdsk /r F: in step 19 - is it correct? But Im not sure what to type in step 20 instead of G...?
    Can you please help me?
    Printscreen: Dropbox - 20180315_001242.jpg
    Last edited by Alessandro; 14 Mar 2018 at 18:42. Reason: link to printscreen
      My ComputerSystem Spec

  5.    14 Mar 2018 #15

    OK I guessed and typed: sfc /scannow /offbootdir=F:\ /offwindir=F:\windows - seems to be running now:
    Dropbox - 20180315_005321.jpg
      My ComputerSystem Spec

  6.    14 Mar 2018 #16

    And I cannot continue, because after typing bootrec /fixboot, I see Access is denied.
      My ComputerSystem Spec

  7.    14 Mar 2018 #17

    And when I power on, it is still the sam BSOD, starting in Safe Mode not possible either, nor the restore point is working, nothing so far...this is mad
      My ComputerSystem Spec

  8. Posts : 22,637
    windows 10 professional version 1607 build 14393.969 64 bit
       14 Mar 2018 #18

    The problem with inaccessible boot device in January was related to Spectre and Malestrom.
    Microsoft responded with Windows updates that had unexpected problems:
    inaccessible boot device
    problems with USB ports
    These are the published fixes:
      My ComputerSystem Spec

  9.    14 Mar 2018 #19

    Thank you, first I removed this one:
    dism.exe /image:c:\ /remove-package /packagename:Package_for_RollupFix~31bf3856ad364e35~amd64~~16299.248.1.17 and it did not help, the previous package is not installed...
    Any idea what can I do please?
      My ComputerSystem Spec

  10. Posts : 22,637
    windows 10 professional version 1607 build 14393.969 64 bit
       14 Mar 2018 #20

    For these steps please use a camera or smart phone camera to take pictures and post images into the thread:
    command prompt > Administrator X:\windows\system32\cmd.exe > X:\Sources> type:
    1) c:
    2) dir
    3) d:
    4) dir
    5) e:
    6) dir
    7) f:
    8) dir
    9) g:
    10) dir
    11) bcdedit /enum
    12) bcdedit | find "osdevice"
    12) diskpart
    13) list disk
    14) list volume
    15) select disk 0
    16) list partition
    17) select partition 1
    18) detail partition
    19) select partition 2
    20) detail partition
    21) select partition 3
    22) detail partition
    23) select partition 4
    24) detail partition
    continue in this fashion for all partitions on disk 0
    and please continue in this fashion for disk 1

    Fix: bootrec /fixboot access denied in Windows 10

    If the above fails there is another option
      My ComputerSystem Spec

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