Corrupted, outdated or inaccurately configured drivers.Windows 10 may not access the system partition due to the following issues: The Inaccessible Boot Device error refers to a BSOD error message that occurs when the Windows 10 operating system fails to access the system partition while trying to start up. Causes of Inaccessible Boot Device Error in Windows 10: But what are the causes of the inaccessible boot device error? Read on to find out. Several Windows 10 users have reported the prevalence of this error message in computers running an SSD. The problem (obviously) forced Windows to restart all over again. Well, this error message implies that Windows couldn’t access the system partition while attempting to start up. Just picture that scene and imagine how it feels. Then, after a few moments, your PC restarts all over again. Imagine eagerly waiting for Windows 10 to reboot itself after an update, only to see the error code 0x0000007b on your screen. However, this auto update is liable to introduce a huge problem.

Windows typically updates itself automatically, which is especially exciting when a new update is rolled out.

Windows 10 boot drive