A number of users report After recent windows 10 Upgrade system fails to start with Blue Screen Error “Inaccessible Boot Device“. Generally, Inaccessible_Boot_Device BSOD ( Bug Check 0x0000007b ) indicates that the OS has lost access to the system’s data or boot partitions during the startup. It may be due to corrupted system files, Missing MBR ( Master boot Record ) or BCD (Boot Configuration Data ) file, while Windows 10 upgrade process. Again Driver conflict between hardware devices or Disk drive failure also causes windows 10 inaccessible boot device BSOD error.
Inaccessible Boot Device BSOD
Whatever the reason, here some applicable solutions you may apply to fix windows 10 Inaccessible_Boot_Device Blue screen error.
Start with Basic Remove all External Devices (except keyboard & mouse) such As printer, scanner, external HDD etc. To Check And make sure Driver conflicts between hardware devices not causing this BSOD error.
Sometimes users report windows 10 suddenly display Inaccessible_Boot_Device Blue screen error, but after one restart system starts normally. But for some others report windows 10 Frequently restart with this Inaccessible Boot Device BSOD error. and didn’t allow to perform any troubleshooting steps to fix the problem. That cause you need to Access the Windows 10 Advanced Startup Options, where you get various troubleshooting tools to fix these startup problems.
Perform Startup Repair
As due to this BSOD windows frequently restart, We need to boot from an installation media to access advanced options. ( if you don’t have then create an installation media/Bootable USB using this link)
When you are ready with bootable USB/DVD insert it and change BIOS setup to Boot from installation media. Skip the first screen and on next window click on repair your computer.
Next window click on Troubleshoot -> Advanced this will represent the Advanced options screen.
Here click on Startup repair, and let windows check and fix the problems which prevent windows start normally and causing ” Inaccessible Boot Device” BSOD error. Startup Repair will scan your system and analyze the various settings, configuration options, and system files as it looks for corrupt files or botched configuration settings. If Startup Repair detects any of these types of problems, it will automatically attempt to fix them. Then after it will automatically Restart windows and start normally.
Fix MBR and Rebuild BCD file
As discussed corrupted or missing system files also cause Inaccessible Boot Device blue screen error. Also most of the users on Microsoft forum, Reddit marked repair MBR (Master Boot Record) and rebuild BCD ( Boot Configuration Data) file resolved the problem for them. If startup repair didn’t fix the problem again access advanced options and click on command prompt. And perform Command below.
This commands check and fixes almost every Boot related problem, and repair corrupted missing BCD, MBR files. Now type exit to close the command prompt and restart windows. Check on next start system started normally.
Boot into Safe Mode With Networking
Also, sometimes corrupted, Outdated or incompatible display driver causes this inaccessible boot device windows 10 BSOD error. 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.
Check for Corrupted System files
When windows boot into safe mode, run the System file checker utility, which scans and restore missing corrupted system files. 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 restore 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.
Also 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.
Check Disk Drive Errors
Sometimes disk drive failure also causes inaccessible boot device, or OS lost access to the system’s data or boot partitions during the startup. We recommend checking the disk drive for errors using CHKDSK command. Also, Add some extra parameter to force chkdsk to repair the disk drive errors.
To check disk drive errors open command prompt as administrator and 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.
This will start scanning the drive for errors if found any the chkdsk utility will repair them automatically. Wait until 100% complete the scanning process after that windows automatically restart and start normally.
Also, Some users report check memory errors using memory Diagnostic Tool help them to fix the BSOD Bug, Some others suggest perform System restore to revert system settings to the previous working state. Which may also help to fix this inaccessible boot device BSOD error.
Did these solutions help to resolve the ” Inaccessible Boot Device BSOD” error on windows 10 computers? which option worked for you, let us know on comments below Also Read Fix No boot device found Error on Windows 10, 8.1 and 7