INACCESSIBLE BOOT DRIVE after adding M.2 drive

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  1. Posts : 42
    Windows 10 Pro
       #1

    INACCESSIBLE BOOT DRIVE after adding M.2 drive


    Have installed an M.2 SSD this evening and during the Windows install it didn't recognise the drive.

    So I rebooted and all hell broke loose.

    Got to the BIOS and then gave a "non-system disk or disk error. No bootable device found." On restart, I struggled to actually get back into the BIOS.

    So I was using Windows 10 iso from Microsoft download. I had noticed that the media creation tool creates the USB which has Install.ESD and not the usual Install.WIM I usually see. Perhaps this is the difference between an ISO and a USB stick install path?

    Anyway, what I reckon has happened is that somehow it has changed my old 2.5" SATA SSD from boot drive to inactive.

    I've gone down a rabbit hole here.

    Here are some screenshots from diskpart:-

    Can anyone tell me how to recover please? I have used EVERY option in Automated Recovery bar Reset PC which to me is a last resort.

    In the meantime, I'll run sfc /SCANNOW /OFFBOOTDIR=E:\ /OFFWINDIR=E:\windows in an elevated command prompt to see if that flags up anything.
    Attached Thumbnails Attached Thumbnails INACCESSIBLE BOOT DRIVE after adding M.2 drive-img_6648.jpg   INACCESSIBLE BOOT DRIVE after adding M.2 drive-img_6649.jpg   INACCESSIBLE BOOT DRIVE after adding M.2 drive-img_6650.jpg   INACCESSIBLE BOOT DRIVE after adding M.2 drive-img_6651.jpg   INACCESSIBLE BOOT DRIVE after adding M.2 drive-img_6652.jpg  

    INACCESSIBLE BOOT DRIVE after adding M.2 drive-img_6653.jpg  
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  2. Posts : 5,391
    Windows 11 Pro 64-bit
       #2

    In this video guide, i'm going to talk about the Windows stop code - Inaccessible Boot Device error and the solutions for it.

      My Computer


  3. Posts : 8,173
    windows 10
       #3

    Why is it showing the disk as raid?
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  4. Posts : 42
    Windows 10 Pro
    Thread Starter
       #4

    @Samuria

    I have no idea. I think default BIOS settings are RAID+AHCI. Would that explain?

    Until the issue, there was a 256Gb AHCI drive which I installed 2 days ago and the Sandisk SSD also bootable ans been working fine for a year.

    Today I took out the 256Gb and put a 512Gb AHCI in. Forgot to diskpart it whilst in OS on Sandisk SATA. So when I came to install OS on 512, it couldnít see the AHCI drive.

    I may have just force closed. I cannot recall.

    Been looking at Advanced Debugging Stop Error 7B write-up on Microsoft which says use BCDEDIT but I think I am getting deeper into a rabbit hole.

    - - - Updated - - -
    @FreeBooter

    Hi. I will try that tomorrow but I donít think it will be update issue because I applied updates 2 days ago and all had installed correctly and PC working fine since until 6pm yesterday when I posted.

    But I will try yoir suggestions and report back.

    - - - Updated - - -

    Also. Freebooter. I am using USB to access RE environment. Do I unplug that too before bcd rebuild?
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  5. Posts : 5,391
    Windows 11 Pro 64-bit
       #5

    No, you don't need to disconnect USB flash drive.
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  6. Posts : 42
    Windows 10 Pro
    Thread Starter
       #6

    @FreeBooter. I could not have slept without trying those suggestions.

    Sadly they didnít work. The BIOS is fine so no need for me to reflash that. Just going deeper into rabbit hole if not careful.

    I think issue could be with drive letters.

    I have a drive letter assigned to system reserved partition. Is there sime way I can recover from that partition?
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  7. Posts : 4,667
    several
       #7

    INACCESSIBLE BOOT DRIVE after adding M.2 drive-hpz420-bios-satamode.jpg
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  8. Posts : 5,391
    Windows 11 Pro 64-bit
       #8

    If you want you can backup your personal files and clean install Windows 10 you can use Hiren's BootPE.

    Hiren's BootCD PE
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  9. Posts : 1,298
    Windows 10
       #9

    Rhothgar said:
    @FreeBooter.
    I think issue could be with drive letters.

    I have a drive letter assigned to system reserved partition. Is there sime way I can recover from that partition?
    Yes something strange is happening here the system reserved partition should not have a letter assigned. Letters should only be on the main partitions which should also have the boot flag under the info column for your boot partition/drive.

    Select that system reserve partition select partition 1 and assign letter= command to remove the drive letter. Then set your primary partition on that drive select partition 2 then set as bootable by using active command and also making sure it has an assigned drive letter too.

    - - - Updated - - -

    INACCESSIBLE BOOT DRIVE after adding M.2 drive-capturedd.png
    Can you do list volume too and display the results here? just so we can see what partitions are on which drives you have and it should help show better how your hard drives are laid out.

    The above image is just example on what you would want to see in comparison having a similar layout.
      My Computer


  10. Posts : 4,667
    several
       #10

    I doubt it has anything to do with drive letters.

    Presumably your sandisk 480gb is a 2.5 in sata ssd which was mbr partitioned ?

    What is this "m.2" disk you added ?

    HP Z420 Boot Windows M.2 SM951 AHCi (only Model MZ-HPV AHCi and Model MZ-HPU )+HP Z Turbo Drive - YouTube
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