Windows 10: C: and D: drives switched letters causing windows to not be able to start. Can I fix it?

Hello!I've not been able to start windows 10 on my computer for about a week now since start-up repair can't diagnose the problem and is unable to give me any information whatsoever. When I was trying out common fixes I noticed the local disk and data drives had switched letters but I didn't really think anything of it. For clarity, they now read: "Data C:" and "Local Disk D:". For some reason it just came to me that you probably aren't supposed to change those letters so I looked it up and found out that they are significant as the C drive is supposed to contain the OS. With that informat

:)

 

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.

 

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!

 

C and D drives are reversed after Windows update

After the last windows 10 update somehow C and D drives were switched so now Windows cannot boot up because it is trying to boot from C drive Volume 1 which is the Recovery drive but my Windows is now on D drive volume 0.

I've tried selecting C drive in command prompt booting from USB drive and assigning it a different letter and Diskpart says that it successfully assigned the letter but when I go to list volume it still has Recovery listed as C and main partition listed as D.

For some reason it is refusing to change C drive to something else even though it says that it is changed. All partitions are listed as healthy. Bootrec /scanos = 0 total identified windows installations.

How do I reverse those 2 for good in command prompt?

I haven't been able to find a good article or video on it.