The Windows 10 upgrade problems were sure to be vast considering the various hardware and complaints in the past for almost all operating system changes, but this fact doesn’t stop the frustration when issues arrive. The latest issue we have heard about is in regard to a Windows 10 inaccessible boot device error, which happens during the update and when rebooting your computer.
Maybe not as widespread as the Windows 10 update error 80240020, the “Inaccessible Boot Device” has stopped upgraders in a more problematic way.
There’s a need to fix this problem on different hardware that includes Acer laptops. Also, in one situation reported to Product Reviews it’s clear this happens when using the Media Creation Tool as well. This particular user was updating from Windows 7 Pro x64 and encountered a problem screen after rebooting, which led to the system restoring their old OS.
After the old OS had installed they received this error message, “0xC1900101-0x40017 installation failed in the SECOND_BOOT phase with an error during the boot operation”. It’s also worth mentioning their storage device used is a new SSD, although they didn’t have any issues with Win 7.
One solution – we have seen a few users disable AHCI in Win 7 and make a few registry changes to get to a working Windows 10 build. One fix for the inaccessible boot device error was to set Start=0 for iaStorV, msahci, and pciide that were originally set to “3”. After making those registry changes, they changed from RAID to AHCI mode in the BIOS.
Have you had the Windows 10 inaccessible boot device error on Thursday April 22, 2021? If so, how did you fix it? As always, any changes you make are at your own risk.