The Unmountable Boot Book Windows stop code error is a pain. Since it usually keeps you from loading into Windows, you tin't troubleshoot it like you would with most other errors.

However, it's possible to fix this error with the correct methods.

We'll prove you how to fix the "unmountable boot volume" mistake and get dorsum into your PC. While these steps are aimed at Windows ten, they're adaptable for Windows eleven too.

What Is the Unmountable Kicking Volume Mistake?

The "boot book" is the partition of your storage bulldoze (an SSD or hard drive) that holds Windows. This error occurs when your computer tin can't load Windows properly, resulting in a bluish screen of death that you lot'll and then demand to troubleshoot.

A "end code" is the specific error message that identifies the problem Windows ran into when you lot see a blue screen—in this instance, information technology's the unmountable kick volume stop code.

Blue Screen Of Death Error
Image Credit: Dmitriy Domino/Shutterstock

This usually occurs due to a damaged file system or corrupted Windows files. Frequently, you'll see it after applying a major Windows update. While this error can too stem from an improperly configured BIOS, that'due south rarely the case, unless you've modified the BIOS on your own.

Thankfully, this error doesn't always mean that your storage drive is dying. Though that may exist the case, we'll walk through other troubleshooting steps for an unmount boot volume first.

Pace 1: Reboot and Check for the Error Again

Like nigh blue screen messages, the unmountable boot book error isn't always something to worry about if you lot simply see it once. Sometimes Windows runs into a temporary hiccup that you never have an issue with again.

If you see the unmountable boot volume error blue screen while working, restart your PC and effort to kicking Windows upwardly again. Yous should exist clear if the mistake doesn't render for some time.

Usually, though, you'll see the unmountable kicking volume error each fourth dimension you try to boot into your PC, and information technology won't let yous load Windows at all. In that case, proceed with more in-depth troubleshooting.

Pace 2: Create a Windows Install Deejay

Since you can't boot Windows usually to solve this consequence, you lot'll need to create a Windows installer on a USB drive or DVD using another machine. This will let you access the troubleshooting tools Windows offers by booting from a different device.

Thankfully, the Windows 10 Media Creation Tool makes it piece of cake to create Windows 10 installation media. If you're on Windows 11, apply the Windows eleven download page for the aforementioned purpose.

Once you've created your installable disk, plug it into your PC and kicking from the USB or DVD. You'll probably need to alter the boot order on your PC to do this. The exact method to do then depends on your calculator.

Step three: Apply Windows' Automatic Repair

Permit Windows start from your USB drive until it loads up, then click the Adjacent push. You'll see the Install at present screen. Simply you don't want to reinstall Windows; instead, click Repair your computer in the bottom-left.

windows repair your computer

On the post-obit screen, select Troubleshoot and you'll open a page of Advanced Options. Cull Startup Repair and cull the target Bone: Windows 10 (or your current version).

From here, Windows will run an automated repair that will hopefully take care of your upshot. In one case information technology's done, leave the installer and try to boot your computer ordinarily. If Windows still shows an unmountable boot book error later on this, keep onto the side by side step.

Step 4: Repair the MBR or GPT

The Master Kicking Tape (MBR) or GUID Segmentation Tabular array (GPT) contains information about where Windows is located on your hard drive and helps the Os load properly when you lot turn your calculator on. If this becomes corrupted, information technology can lead to an unmountable boot volume message.

To repair the MBR or GPT, boot again from your Windows x or WIndows 11 install media and select Repair your computer > Troubleshoot. This fourth dimension, on the Avant-garde Options screen, cull Command Prompt.

Advanced startup repair Windows 10

At the Command Prompt, type the following command to run an MBR repair:

          bootrec /fixmbr

Wait until it completes, then run the following commands i at a time to attempt additional repairs. If your deejay uses GPT, these are the principal commands to attempt a fix: 

          bootrec /fixboot
bootrec /rebuildbcd

Type exit to get out the Control Prompt once these end running. So reboot again and see if the boot volume mistake continues to popular up. If information technology does, y'all might want to run advanced MBR troubleshooting.

Step five: Run the Chkdsk Command

If the automatic repair and MBR/GPT repair don't solve your trouble, you should side by side try Chkdsk. This important Control Prompt tool lets yous check the storage drive for errors, which may exist the cause of the unmountable boot volume message.

Follow the above steps again to open up a Command Prompt from the recovery menu, and so enter the following command:

          chkdsk /r c:

The /r flag locates any bad sectors on your disk and fixes those errors. If you don't include this, Chkdsk volition but report errors information technology finds. You lot demand to include c: so the operation scans your Windows sectionalisation (the virtually mutual location for it). Replace c: with d: or another letter if yous've moved yours somewhere else.

Chkdsk may tell you that the volume is already in use, and ask yous to run it next time the organisation restarts. If information technology does, enter Y for yes and reboot to start the process.

CHKDSK command in Command Prompt

This can take some fourth dimension, so you may have to wait a bit. Once it's washed, reboot again and come across if the boot volume issue has cleared up.

Step vi: Try an SFC Browse

For the last Control Prompt solution, you lot tin try another of import utility. SFC, or System File Checker, looks for corrupted Windows system files and attempts to set up them. If nothing above has fixed your issue, this is worth a try.

Open a Command Prompt on your recovery bulldoze again, then enter the following command:

          sfc /scannow

Wait until the process completes; it will tell yous if it fixed anything. Like the other commands, after it completes yous should reboot and endeavour to load into Windows once again.

Should this fail, you can endeavour a DISM browse before moving onto other potential fixes. Come across how CHKDHSK, SFC, and DISM differ for more info.

Still Have an Unmountable Boot Book? Test Hardware and Reinstall

If you've completed these troubleshooting steps and continue to see an unmountable boot volume error every time you boot, your problem is deeper. At that place are ii further solutions to attempt.

First, you may have a hardware issue. Your hard disk or solid-state bulldoze could be corrupted, dying, or suffering from a faulty connection. If yous're confident, open your computer (which is easier on a desktop than a laptop) and cheque to brand sure the drive'southward cables are all securely connected. Sometimes faulty RAM can besides cause this problem, then make sure the RAM is properly seated.

If you cheque the connections and everything looks OK, you should run some Windows diagnostic tests to determine if a component is dying. Replacing information technology should gear up your result, merely you'll need to talk to an experienced calculator technician if y'all can't swap the components out yourself.

CrystalDiskInfo home screen

After ruling out hardware, your Windows installation may be corrupted in a way that the in a higher place utilities tin't repair. In that case, your only option is to reinstall Windows and hopefully fix the problem by starting fresh. This is a pain and takes time, but isn't as wearisome if you have a fill-in. You may want to first run through other potential fixes when Windows won't boot before taking this intensive stride.

Hopefully, you backed up your files before you ran into this issue. If not, see how to recover information from a estimator that won't boot. You may exist able to retrieve your files, fifty-fifty if Windows doesn't load.

Resolve the Unmountable Boot Volume Mistake Today

We've looked at several steps for fixing an unmountable boot volume terminate code error in Windows 10 or Windows xi. Since this is unremarkably caused past file corruption, running the higher up scans from a Windows recovery disk should fix it most of the time. But in the worst cases, you lot'll need to diagnose your hardware or even reinstall Windows.

This isn't the only blazon of boot mistake you'll experience in Windows. Y'all may also meet "Inaccessible Boot Device," which is a unlike problem.