How to Fix Bug Check 0x7B: INACCESSIBLE_BOOT_DEVICE

The INACCESSIBLE_BOOT_DEVICE bug check has a value of 0x0000007B. This bug check indicates that the Microsoft Windows operating system has lost access to the system partition during startup.

If the PC suddenly loses access to the system partition during startup, then the “0x0000007b” error screen is displayed and the boot process is halted.

• Make sure Windows installed hard drive connected correctly.
  
  
• Make sure Windows installed hard drive first boot device from within BIOS Setup Utility.
  

Repair Boot Sector

Boot your computer with Windows Installation DVD and from Windows Recovery Environment (WinRE) start the Command Prompt.

Type below commands one at a time at the Command Prompt and press Enter key for each command you have typed.

Following commands will repair Master Boot Record (MBR), Boot Sector and BCD Store.








Check The Hard Disk With CHKDSK Utility

Boot your computer with Windows Installation DVD and from Windows Recovery Environment (WinRE) start the Command Prompt.

Type below command at the Command Prompt and press Enter key.

Following command will  fixes errors on the disk and locates bad sectors and recovers readable information.




Replace partition drive letter C: with Windows installed partition drive letter.  When computer boots into Windows Recovery Environment (WinRE) environment the drive letter assign to Windows partition may not be C: drive letter because Windows 7, 8 , 8.1 and 10 creates a separate system partition when it's installed from scratch. The system partition contains boot files WinRE assigns the system partition the C: drive letter and the Windows installed partition will be assign any other drive letter usually D: drive letter is assign to Windows installed partition. The Bcdedit /enum | find "osdevice" command can be use to find out the drive letter of the Windows installed partition the output of the Bcdedit command is similar to this osdevice partition=D:. The drive letter after partition= is the drive letter of the Windows partition.





Repair Corrupted Windows System Files With the SFC Utility

Boot your computer with Windows Installation DVD and from Windows Recovery Environment (WinRE) start the Command Prompt.

Type below command at the Command Prompt and press Enter key.

The following command scans integrity of all protected Windows system files and repairs files with problems when possible.



Replace the partition drive letter C: with Windows installed partition drive letter.


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