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Published: February 2, 2012 | Applies to:

This article will show you how to fix error "0xc000000f - The Boot Selection Failed Because A Required Device Is Inaccessible" at Windows Boot Manager.

Sometimes instead of blue screen of death (BSOD), we get errors of similar codes from boot manager. This errors are resultant of damaged files due to changes made by software. One of these error is “0xc000000fThe Boot Selection Failed Because A Required Device Is Inaccessible“.

Following is the screenshot of this error:

Also checkout this as well : The Boot Configuration Data File Is Missing Some Required Information In Windows 8

In this article, we’ll tell you how to troubleshoot this error with the help setup disc.So, here we go…

FIX : Error “0xc000000f – The Boot Selection Failed Because A Required Device Is Inaccessible”

1. Insert the setup disc under the DVD drive (setup disc of any Windows OS can be used here). For example, let us consider that we’ve entered setup disc of Windows 7 or later.

2. Due to this error, the system partition is still in working order, but aid to this recovery tools will suspect for installation on another partition. So it will show 0 MB however the actual size of that partition is 38 GB (consider for an example). Click the Next button after locating Windows 7 under System Recovery Options.

3. Now enter the following commands one by one:

list volume

It will indicate the RAW volume, which is actually the NTFS partition and is responsible for the generation of boot error.

4. Now our main target is to convert this RAW volume into NTFS partition. To do so, type the following command:

chkdsk /r /f d:

Once this command used, the main partition now generates the error “The first NTFS boot sector is unreadable or corrupt.But the good thing is that it actually repairs the second partition.

In this way RAW volumes is converted into NTFS partition. Also the other errors involving indexes, master file table etc. are identified and repaired automatically. Reboot the machine, error should be disappear now.

That’s it! Similar fixes that you must read about:

1. [FIX] Windows 8 Master Boot Record Is Corrupted

2. [FIX] Windows 8 Freezes At Boot Screen

Kill many issues in your system using few steps at once:

1. [How To] Refresh Windows 8.1

2. [How To] Reset Windows 8.1

3. [How To] Reset Or Refresh Windows 8 Without Installation Disc

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  • thanks bro.. awesome article and a great job on screenshots…. welldone!!

  • I think you there is a mixing of drives. thinking of checking bios setting

  • Great topic! one thing is sure that you r putting only working content anyway this error can be fixed easily with Easy BCD in case you dont have DVD:

    Enjoy @

  • @ odio too costly software mate! not enough money to waste on simple issue ;)

  • Never got such issue bt thnx for valuble info____

  • wow truly admirable!

  • Don’t we start the PC in safe mode with this error???

  • this doesn’t work it delete my disk :(

  • I have laptop Sony vaio EA45FG10 with windows 8.1 licensed.
    It is giving error
    //boot/bcd missing or corrupted
    Also winload.exe missing or corrupted
    It takes half an hour to display this error everytime I restart.
    Now main problem is it is not detecting any flash drive or CD.
    I tried changing bios settings but also not working.
    I cant access cmd also..
    Please tell me what to do. How to backup my important data…

  • Kapil Arya

    ^^ If you have setup disc with you, try installing Windows 8.1 in a parallel drive. Once it is installed, you can backup all the data from main drive. If you wish you can use this newly installed OS, since it will also fix boot menu related issue.

  • Hi,

    i did all the steps but it didn’t work.
    I have Win. 7

    After i did diskpart – it told me that all volumes are healthy.

    After doing chkdsk /r /f d: it said: “corrupt master file table. Windows cannot recover master file table. Failed to transfer logged message to the event log with status 50.”

    Please help.

  • Kapil Arya

    ^^ Try to use the Bootrec.exe tool in the Windows Recovery Environment to troubleshoot and repair startup issues –

  • Hi, I have this problem on Windows 8. Until step 3 everything is correct and my RAW volume has assigned letter E:.

    When I type ‘chkdsk /r /f e:’ (step 4) I have message from system:
    ‘The type of the file system is RAW. CHKDSK is not available for RAW drives.’

    Do you know why step 4 doesn’t work on my PC?

    Please help :-) Thank you.

  • Kapil Arya

    ^^ Seems like the disk has failed. Refer:

  • Hi I use but I am installing win 8 again the text appears

  • Kapil Arya

    ^^ This works for Windows 8 too :)

  • Thanks Its so useful

  • Thank you so much for you help, this really works on my surface pro.

  • Kapil Arya

    ^^ Glad we could help :)

  • I tried your way but d drive is already ntfs and , line has
    “Failed to transfer mssgs to event log w/status 50” also recovery says empty I cant find anything in the d:.

  • Kapil Arya

    ^^ Do you have RAW volume on any other drive?

  • Hi Kapil,

    I have the same problem as Marek,until step 3 everything is correct and my RAW volume has assigned letter c:.

    When I type ‘chkdsk /r /f c:’ (step 4) I have message from system:
    ‘The type of the file system is RAW. CHKDSK is not available for RAW drives.’ I have read kb300415 please how do i use the diskpart command to repair my raw volume and convert it to ntfs?

    Please help I have read your articles but am stuck on this issue and cannot proceed. My laptop was running on win 8.1 when the reset failed.

    Thanks in advance.

  • The partition size when I first started up was not 0 and when I did the command chkdsk /r /f d: it gave me a list of commands. Also everything was NTFS with no RAW. But the error message in the image is identical

  • Hi Kapil,
    I had Toshiba L740 with Original preinstalled Windows 7 Home basic. along with Ubuntu 14.04 working well. On invitation, registration Windows 7 was upgraded to 10, after the installation is completed, Windows10 would not start, even after repeated repairs & also cannot return to Windows 7 . Is there any way Windows 10 installation can be repaired, without loosing Ubuntu Distribution.
    Thank You.

  • Kapil Arya

    ^^ Suggest you to make clean install of Windows 10 and see if it helps:

  • The way II am using is first I changed the raw drive to NTFS by entering in cmd prompt
    -Disk part
    -List volume
    (If volume 1 is raw)
    -Select volume 1
    Then type
    -Format quick fs=ntfs
    Then I followed this guide with chkdsk

  • After step 4
    I seen that all the volumes are ntfs..
    Now what to do next

  • Kapil Arya

    ^^ So I hope the issue must have got resolved by now :)

  • I cant boot from cd or usb or dvd
    After make all steps of this tuto and others it is imposible for me boot my tab.
    I press esc key and i can input some code to localize and load bcdboot. I try to install windows8.1 custom without boot. Wim burned and i break tablet

    I own chinesse tablet chuwi vx8 3g it doesnt have designed key to enter uefi config….. Hiw to fix bcd?? Please help me.

  • Kapil Arya

    ^^ As you’re on Windows 8, I hardly suggest you to use Refresh feature at this stage:

  • I doesnt have acces to. Recovery options, so i cant refresh pc. More way? Help me

  • Kapil Arya

    ^^ In that case, try the suggestion mentioned in my first comment here.

  • I try suggested method but hard drive is doesnt in first boot option. Since i own chinesse tablet without key to direct load uefi config i need to see advanced menu and press change uefi bios settings. This menu doesnt load!! Any other way? Please

  • Kapil Arya

    ^^ Then clean install is the only way :(

  • Hello Kapil, I have the error code mentioned and I do have a RAW partition, but it has NO drive LETTER. How could I proceed to change the RAW partition to NTFS? Thank you for your very informative website.

  • Kapil Arya

    ^^ You need to first assign drive letter and then try command mentioned in step 4.

  • Hi admin. I get uefi config now and get usb quith windows 8.1 in my hands.. Mistake is i get The selected disk is not a fixed MBR disk.
    The ACTIVE command can only be used on fixed MBR disks.

    How to. Solve it? I see here and nothing…

  • Volume is not raw. Is hidden…

  • Kapil Arya

    ^^ Have you tried clean install as per my last suggestion?

  • Now windows is installed!! Allrigth i try to reload tabket and reinstall since i delete volume.

  • Kapil Arya

    ^^ Wooho! that’s the perfect news I got this morning :)

  • :-$ i charge 1 hour my tablet and with usb with windows 8 with esc key to load uefi config and diskpart i cleand format convert unhide and delete volume 0. Then i can reinstall windows. Great!!

  • I get this error WHEN booting to my recovery USB drive? :(

  • I have a dell with the blue screen recovery error 0xc000000f and I have my install CDs. I cannot do any of the things you have mentioned as the only thing I get is the blue screen. I have windows 7 but did the free upgrade to Windows 10 and my system was fine until it did an upgrade and restarted. Please help.

  • Kapil Arya

    ^^ On Windows 10, you can perform Startup Repair and see if that helps:

  • Many thanks

  • i tried using chkdsk /r /f f: its shows chkdsk is not available for RAW drives.

  • chkdsk /r /f d: worked perfectly on a SSD disk, just as described in the dos window above.

    Windows up running again.

    Thank you for great assistance :-)

  • Kapil Arya

    ^^ Glad it worked! :)

  • Help – Windows 10 – 3 Partitions PDQ, System Reserved, and Raw. Partition is raw, no drive letter, diskpart used to assign a letter, then ‘chkdsk /F (driveLetter)’ all goes well reads copy boot record and fixes file system. but as soon as system rebooted drive partition is raw again. Tried testdisk, and Active@disk editor to restore the partition MBR, Tesk disk appears to repair MBR but Active@diskeditor throws up the following error – Unable to write data on Acer (E:) at 0, So cloned the drive to a clean new disk. Ran the same procedures, Same problem occurs. Upshot is the partitions copy boot record won’t rewite the partitions corrupt master boot record. Is this Fixable ?


  • I’ve run into this problem several times with Windows 10 – it appears that from Windows Vista onward, Windows itself is very finicky if you have it installed to SSD or USB-connected drives, especially SSD drives. I find it a best practice to keep a second installation of Windows 10 installed to another drive along with Visual BCDEdit to deal with this when it does happen. I don’t know what the cause is, but I am suspecting that drives of the SSD type are powered off before Windows finishes writing to the disk during a reset/power off/update cycle and this corrupts the BCD Store and MBR on the drive.

  • Kapil Arya

    ^^ Appreciate your inputs on this :)

  • too technical for many people out there some people arent very computer minded to do this why are people having trouble upgrading to windows 10 maybe its a flaw with this windows 10 thing afteral its free you dont get anything for nowt do you i am sticking to what i have got i do not want a bricked laptop

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