Windows 10: Win Restore failed but SWITCHED C: and D: drives

Because of a faulty driver, I tried to restore from a recent restore point. It failed, but on reboot I got BSOD THREAD STUCK IN DEVICE DRIVER and CRITICAL PROCESS DIED. Win Startup Repair reboot and Automatic Repair, reset and reinstall all failed.

CMD shows that the C: and D: drives have been reversed. Meaning data on C: are now in a corresponding folder on D:

I am able to copy files to USB, but is this repairable? Don't know where to go.

:)

 

Boot error INACCESSIBLE_BOOT_DEVICE, drive letters C: and D: switched

Issue:

Error (blue screen) when booting with stop code (DE Stillstandcode) INACCESSIBLE_BOOT_DEVICE. Computer restarts automatically and then freezes with message “automatic repair being prepared” (DE “Automatische Reparatur wird vorbereitet”). After manual
shut down, the same happens all over again.

System:

Lenovo IdeaPad C340-15IWL with pre-installed Windows 10 (updated to latest version / fixes) with two drives:

128 GB SSD with Windwos and program files (C: “Windows-SDD”)

1 TB HDD as data storage (D: “Data”)

Reason:

Not clear. Just three days before a BIOS update (ALCN28WW V2.05) has been installed, after which the fingerprint scanner didn’t work any longer. Lenovo support suggested to reset BIOS to defaults and re-install driver, which did not solve the problem,
but at least the computer still worked. After another restart, the issue occurred.

Troubleshooting:

1) Loaded default settings in BIOS again
no change.

2) Booted from Win 10 installation USB flash drive, chose repair options (DE “Computerreparaturoptionen”), then troubleshooting (DE “Problembehandlung”), then start help (DE “Starthilfe”)
PC could not be repaired; then chose advance options (DE “Erweiterte Optionen”), command prompt (DE “Eingabeaufforderung”); change to drive C: and D: and could see that all directories are still there, BUT DRIVE LETTERS
ARE SWITCHED: C: shows as “Data” holding all directories formerly under D:, and D: shows as “Windows-SDD” holding all directories formerly under C:

Pretty sure that this switch of drive letters is related to the issue (Windows probably tries to boot from C:, which is the wrong drive now), not idea how this came, and no idea how to switch it back to make Win work again.

Thanks for any helpful suggestion!

 

Win 10 Parallel Installation - Win 8.1 in C: Drive & Win 10 in D: Drive

You can do this but it is a little trickier. Here is my advice:

• If I understand correctly, you have 2 partitions at this moment: a drive C were your current windows resides and a drive D, probably with your files (this is also my setup)
• The first step will be to create a partition for Windows 10 (cut part of drive D). You can do this in disk manager. If you don't know how, please ask and I will give you the details
• Create a system image of your current Windows
• Upgrade your current Windows to Windows 10 (you cannot skip this part if you want the free upgrade)
• Restore your previous Windows to it's current location (partition)
• Do a clean install of Windows 10 in the partition you reserved in step 2

Windows 10 will see that you have another windows installation and add it to the boot manager. At this point you will be able to boot both Windows versions

 

Boot error INACCESSIBLE_BOOT_DEVICE, drive letters C: and D: switched

Hi,

Thanks for the reply. I did as suggested, but it did not solve the problem.

Not sure from which drive I'm supposed to execute the commands and if this matters at all. When entering command prompt mode, I was on drive X: and can change to C: and D:, I executed first on C:, then on D:, with same result:

BOOTREC /FIXMBR -> process completed

BOOTREC /FIXBOOT -> access denied

BOOTREC /scanos -> 0 Windows installations found

BOOTREC /rebuildbcd -> 0 Windows installations found

As indicated in my original post, drive letters C: (was originally the SSD with Windows and program installations) and D: (was originally the HDD holding data) have somehow switched. When I go to C: in command prompt and execute DIR, it shows me all the
content that was supposed to be on D: and vice versa.

That means, I can find the Windows directory that was supposed on C: under drive letter D: now, which might be a symptom of the issue, or the root cause.

So might it help to switch back drive letters C: and D:, and how can this be done?

Thanks and regards.