▷ Repair inaccessible boot device error windows 10 and similar

The errors usually appear gradually in Windows and some of them have more or less complicated solutions. In this article we will cover the inaccessible boot device error Windows 10. This error directly causes our computer to be unable to boot the system due to an error in the MBR (Master Boot Record)

Index of contents

In addition to this error, others with similar characteristics may also appear, for example:

BOOTMGR is missing or corruptedcom is missingNo bootable device - insert boot disk and press any keyNTLDR is missing or corruptedSYS is missingdll is missing

These errors are all related to the BCD or Windows startup, which allows detecting which partition or drive has the operating system installed and booting the system from it. Its content is similar to that of a menu (Windows Boot Manager) that has this information inside.

These errors have various causes, such as sudden computer shutdown, missing a file after a failed update, unconfigured BIOS or UEFI, or physical damage to the hard drive or boot sector. Let's look at some solutions now.

Start in safe mode

If the error appears as a blue screen, it is possible that the solution is quite simple, the only thing that we will have to achieve is that the menu of recovery options of Windows 10 appear. It is not worth the one that would be shown in an installation USB that would not have the option that interests us.

To get this menu, we will leave the window with the error until the computer restarts after a while. If we don't restart it. After three of these restarts the recovery menu should exit.

Now we must click on the option " Repair equipment ", located at the bottom left of the window that appears to start the installation. In the next window we will have a small menu of options in which we must choose " Solve problems "

Now we choose " Advanced Options "

Finally we click on the option " Startup configuration "

A menu will appear in which we are informed that in the next reboot we will basically be able to enter the system in safe mode. We must click on " Restart " We restart and a menu will appear where we can choose different options to enter safe mode We have chosen the basic one with the " 4 " key

Once you have started Windows completely (if you have been able to) we reboot and everything should have been fixed. When Windows starts in safe mode it normally performs repairs that affect the system startup.

Windows 10 Startup Repair

The following solution can be done both with the recovery menu in the previous section and from a Windows 10 installation DVD or USB.

The option that intern us now is also located in advanced options, in this case called “ Startup repair ”

If what we want is to do it with an installation medium, the first thing we must do is have a Windows installation DVD or USB and the capacity so that the BIOS can start this before the hard disk

To do this visit these tutorials:

Having said that, we will introduce the device and the Windows 10 installation window will appear, in which we will choose the installation language.

Now we must click on the option " Repair equipment ", located at the bottom left of the window that appears to start the installation. In the next window we will follow exactly the same steps as in the menu previously seen. The result will be the same for what we click on " Startup repair " We select the operating system

And the startup repair process will begin.

When we are finished, we will see if the error has been solved.

Use the CHKDSK command

Another solution we propose is to use the Windows CHKDSK command. Thanks to this command, the hard disk will be scanned for possible errors in the data and in the boot sector.

This we can also do, either with the Windows recovery menu or with the USB system installation.

We will follow the same steps until accessing the " Advanced Options " section. Then we click on the " Command Prompt " option on the next screen of options.

In this way the window will appear to enter commands where we will have to carry out the pertinent actions

Now we must locate which is the partition of the hard disk that contains the installation of Windows 10, for this we are going to use the diskpart tool. We write the following command:

diskpart

We will enter the tool, now:

list disk

To see what hard drives we have to enter the Windows we must know its capacity at least. When we are sure we write:

sel disk

list vol

To list your partitions

In our case the largest partition is the system installation partition and they have the letter “D”, we will take this information for CHKDSK

To leave we write

exit

Now, to be more sure that this is the correct partition, we can see its content with:

dir :

We execute the command in question:

chkdsk : / f / r

We can also run another command called SFC to perform the functions of scanning and repairing files, for this:

sfc / scannow

We wait for it to finish and check if the error has been fixed.

Restore boot loader from Windows 10

In this solution we will perform a manual repair of the MBR through the command prompt, so once again what we will have to do is enter the Windows recovery menu. This can be done from bootable USB or from the system menu if we can access it.

We will go to the recovery options, within them to the advanced options and again we will choose " Command Prompt"

We will now place the following command:

bootrec.exe / fixmbr

We also recommend running the following commands:

bootrec / RebuildBcd

bootrec / fixboot

In this way we will manually fix the startup boot and with it the MBR

Boot Loader repair with bcdboot

The last option that we will see to try to repair the inaccessible boot device error is by reinstalling the BCD with another method.

Once again and exactly the same as in the previous sections, we access the command prompt from the Windows recovery menu

Now we put the following command

diskpart

We will enter the Windows disk management tool.

list disk

We list the hard drives and choose the one with the installation with:

sel disk

For example, if it is disk 0 we will put "sel disk 0"

list vol

We list the partitions of the selected disk. Here we must identify a partition of approximately 500 MB in which case it has the distinctive "Reserved"

We must also locate what is the letter where the Windows system is installed, in our case it is the letter "D:"

select volume

In our case it would be volume 1. If it does not have a letter, we assign it one, for example:

assign letter = R

Ours does have lyrics already. We now exit diskpart with the command:

exit

And we enter this unit with the letter just assigned:

To be sure that it is the partition we are looking for, we write " dir " and no content should appear.

Now we introduce the command that matters:

Bcdboot : \ Windows / l en-us / s R: / f all

Now it only remains to exit the command prompt and restart the computer. We will see if the error has been solved.

In none of these cases will we lose the Linux boot loader if we have another system physically installed on our computer, for example Ubuntu.

Final option: reinstall Windows

If nothing has worked for you, consider reinstalling Windows 10. Don't worry because Windows can make a folder called " Windows.old " where all the system information that was previously installed is stored.

Follow this tutorial to see the process:

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Have you been able to solve your error, with which of these solutions? Leave us in the comments what procedure you have carried out.