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Windows 10 Unmountable Boot Volume

 

Fix 1 – Chkdsk

  1. Start your computer using a Windows 10 DVD or a USB drive. If you don’t have any Windows 10 media available, visit this page and follow the steps to create one using the Media Creation Tool.

  2. Once starting using a DVD or USB device, select the “Repair your computer” option located at the lower-left corner.

  3. Choose “Command prompt“.

  4. At the command prompt, type the following, then press “Enter“:
    chkdsk /r c:

  5. If your bootable drive is a letter other than “C”, replace “c:” with the bootable drive letter you use.
    Select “Y” for yes on the question regarding checking the disk the next time the system restarts.

  6. Restart the system. Be patient while chkdsk checks your drive for errors. It could take a really long time.

CMD in automatic repair will not run chkdsk.  Error is "Windows cannot run chkdsk on this volume because it is write protected."  It needs to be elevated to administrator.

Try restarting in Safe Mode

  1. Press [Shift] If you can access any of the Power options described above, you can also restart in Safe Mode by holding down the [Shift] key on the keyboard when you click Restart.

  2. Using the Start menu. ... Start > Settings cog > Update & Security > Recovery > Advanced start-up > Restart now.

  3. By pressing [F8]

  4. From Automatic Repair: Troubleshoot > Advanced options > Start-up Settings > Restart,

 

Fix 2 – Fix Master Boot Record

  1. Start your computer using a Windows 10 DVD or a USB drive. If you don’t have any Windows 10 media available, visit this page and follow the steps to create one.

  2. Once starting using a DVD or USB device, select the “Repair your computer” option located at the lower-left corner.

  3. Choose “Command prompt“.

  4. At the command prompt, type the following, then press “Enter“:
    bootrec /fixboot

  5. Restart the system. Be patient while chkdsk checks your drive for errors. It could take a really long time.

Fix 3 – Automatic Repair

  1. Start your computer using a Windows 10 DVD or a USB drive. If you don’t have any Windows 10 media available, visit this page and follow the steps to create one.

  2. Once starting using a DVD or USB device, select the “Repair your computer” option located at the lower-left corner.

  3. Choose “Troubleshoot” > “Advanced options” > “Automatic Repair” > “Next“.

  4. Select the OS you wish to repair.

  5. Be patient while the utility attempts to repair the files.
     

 

If none of these steps work, you may have a bad hard drive that needs replacement.

 

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Revised: 07/03/18