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Fix windows 10 Inaccessible boot device BSOD, Bug Check 0x7B


After Recent Windows 10 Upgrade, Getting inaccessible boot device BSOD error At Startup? Due To this Blue Screen Error INACCESSIBLE_BOOT_DEVICE Windows Frequently Restarts and fails to Start normally? Generally, this error inaccessible boot device Bug Check 0x0000007B indicates that the OS has lost access to the system’s data or boot partitions during the startup. Or System cannot read the Windows partition on the hard drive it boots from.

There is a various reason that can cause this inaccessible boot device BSOD Error on Windows 10. It could be a disk drive failure, loosely connected data cables within the system board, and HDD. Again Corrupted files in the Boot partition or if Bootmgr missing you might experience an inaccessible boot device error in Windows 10.

Inaccessible boot device Windows 10

If this is the very first time you have experienced this error a simple restart can help.

Also Remove all external devices (such as external HDD, printer, scanner, etc ) exclude keyboard and mouse, and start the computer normally to make sure any external device not causing the issue. If you notice after remove external devices windows started normally then find out the problematic device and check the same with another computer for the compatibility issues.

If you are using 2 HDD on your System I would recommend completely remove the Secondary drive.

Some Times lose Connection between HDD and System board also causes this BSOD error. If you are using Desktop PC, open the case and check the SATA cable is connected properly between HDD and System board.

Just Restart your System And enter the BIOS by pressing F2/del key repeatedly at the startup. F2 is the default for most operating systems, but if it doesn’t work for you then at the POST screen take a  closer look to see which key is set to enter BIOS and then reboot again and use the appropriate key to get into BIOS.

Here go to main -> SATA Mode And Here select AHCI Mode instead of IDE from the list. Again Move To the boot Tab and change Frist Boot To HDD. Press F10 To save changes on BIOS setup and Restart windows Check Started normally.

If your boot drive is not listed in your BIOS, it may have failed. Try another drive in its place to check cable/power/connector. If the other drive shows up, it’s probably drive failure. If it doesn’t show up, try a different IDE or SATA port, cable and power connector.

Access the Windows 10  Advanced Startup Options And click on Startup Repair To check And fix if any Missing/corrupt boot configuration settings or Corrupt registry settings causing the issue.

Follow these things, If you can access your PC at least login screen:

  • At first, Press and hold Shift from Keyboard and Click on the Restart button.
  • Then, Go to Troubleshoot > Advanced Options > Startup Repair.

If you can’t access your PC –

  • Insert Bootable Windows Media in USB and restart Your PC ( If you don’t have, Read how to Create a bootable Media/USB )
  • Press any key to access the setup Window.
  • Go ahead and choose to Repair your Computer.
  • Now, Go to Troubleshoot > Advanced Options > startup repair

Advanced Boot options on windows 10

Fix Boot Components

After startup repair windows start normally without any BSOD error. If windows fail to start again from Advanced options click on the command prompt And perform the command below to

As discussed before the main reason behind this inaccessible boot device BSOD error is, OS has lost access to the system’s data or boot partitions during the startup. It may be because the master boot record (MBR) file, Boot configuration data (BCD) file missing or get corrupted which may be causing the issue. And running the command below helps to deal with this issue.

bootrec /fixmbr 

bootrec /fixboot

bootrec /rebuildbcd

bootrec /scanos 

Repair master boot record

Boot into Safe mode with networking

Most of the time Repair master boot record (MBR) file and Boot configuration data (BCD) Fix the BSOD error and Windows start normally. But if still getting the same BSOD Then there may be corrupted, Outdated or incompatible display driver causes this inaccessible_boot_device windows 10 BSOD error. Also, Some third-party applications, corrupted system files, Disk drive errors also cause this Blue screen error on windows 10, 8.1, and 7. That cause you need to boot into safe mode, Where windows start with minimum system requirements and allow you to perform troubleshooting steps. Read how to boot into safe mode on windows 10, 8.1.

Scan And Check Hard Disk For Errors

As discussed before disk drive failure also causes inaccessible boot device, or OS lost access to the system’s data or boot partitions during the startup. Running the CHKDKS command is very helpful which check the disk drive for errors and fixes them if found any.

When windows start in safe mode open the command prompt as administrator, Then type command chkdsk c: /r /f and hit the enter key. Then press Y to confirm to run the disk check on next restart, Close command prompt, and restart windows. wait until 100% complete the scanning process after that restart windows and check the system start normally.

Run SFC and DISM command

Also Run the System files checker Utility which scan and restores if any corrupted, missing system file causing the issue. To do this open command prompt as administrator, Then type sfc /scannow and hit the enter key. This will start the scanning process for missing, corrupted system files. If found any damages, missing system files the SFC utility automatically restores them from a compressed folder located on %WinDir%\System32\dllcache. Wait until 100% complete the scanning process, After that restart windows and check there is no more inaccessible boot device blue screen error.

If system file checker scanning results Windows Resource Protection found corrupt files but was unable to fix some of them, that cause you need to run the DISM tool which repairs the system image and allow sfc to do its job.

Disable Fast startup

When windows start into safe mode first open Control panel -> Power Options -> Choose what the power buttons do -> Change Settings that are currently unavailable -> and uncheck Turn on Fast Startup to disable the fast Startup options. Which fix most of Windows 10 Startup problems include BSOD error, Black screen error, etc. Read what is fast startup feature and why we need to disable this feature.

Uninstall Any Recently Installed Application

If the error started to appear, immediately after you installed an application or install a new driver. Then there is a chance that this new program could be causing the error. That cause you need to remove the application from Control Panel > All Control Panel Items > Programs and Features. Now select the recently installed Application and click uninstall.

Sometimes Reinstall the Device driver and Run the Memory Diagnostic tool to check memory errors Also be a handy solution to deal with different BSOD on Windows 10 PC.

These are some effective solutions to fix inaccessible boot device BSOD errors applicable to Windows 10, 8.1, and 7. And I am sure applying these solutions fix the BSOD error and your PC starts normally. Still, have any query, suggestion about this post feel free to discuss in comments below. Also, Read 7 working solutions to fix windows 10 slow boot or startup problem 2018

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