Windows 8 and 8.1 Forums


How can I change system C: drive?

  1. #1


    Posts : 1,875
    Windows 10 Pro Prieview x64

    How can I change system C: drive?


    I have a VHDX which I sometimes boot from and sometimes use as a VM in Hyper V. It has Windows installed on the default C: drive.

    This is somewhat confusing as the C: may be the original C: drive or the VHDX C: drive (with the original C: drive renamed to H: in my case). I want C: to always be the native boot and T: (for example) to always be the boot for the VHDX.

    Can I change the VHDX to have Windows installed to say T:? I was thinking of renaming all instances of C: to T: in the registry and updating BCDEDIT. It is not possible to change system disk in disk management.

    If this is not possible can I re-install windows on the VHDX and specify a different letter and C:?

    This is how it looks when booting from VHDX:

    Code:
    DISKPART> list disk
      Disk ###  Status         Size     Free     Dyn  Gpt
      --------  -------------  -------  -------  ---  ---
      Disk 0    Online          465 GB  1024 KB
      Disk 1    Online          931 GB    31 GB        *
      Disk 2    Online          483 MB      0 B
      Disk 3    Online           65 GB   381 MB
    Attached Thumbnails Attached Thumbnails Capture.PNG  

      My System SpecsSystem Spec

  2. #2


    Hi

    Not sure whether helps but i would recommend trying this :

    How to restore the system/boot drive letter in Windows

    How to Change Windows Drive Letter Using Registry in Xp: 18 Steps

    Boot from the VHD and try changing the OS partition's letter to "T".
      My System SpecsSystem Spec

  3. #3


    Posts : 1,875
    Windows 10 Pro Prieview x64


    Thanks - I'll try it and see....
      My System SpecsSystem Spec

  4. #4


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    By convention, when you install Windows, the letter C: is reserved for Windows and nothing you can do about it, ,not when the windows is active, disk management/dispart will not allow you to re-assign to any other letter on the current boot/pagefile volume.
    Looking at the screen shot, I think you are currently booting from the virtual VHDX and your other Windows partition is re-asigned to H:, This is normal, you can re-assign to any other letter or even remove the drive letter to make it invisible but once you boot from it, its letter will be C: again and your Virtual VHDX will probably re-assigned to be H:. In another word, when you boot the VHDX, it will see your other Windows as another regular drive, and pick one letter available to assign it and vice versa.

    I have 2 SSD's, both run Windows and that's how it works. The drive letter assignment is interchangeable, so not to be confused about it, I remove the letter to make it invisible and the same for the other. It'll be better so I don't mess around with the other currently not active.
      My System SpecsSystem Spec

  5. #5


    Posts : 1,875
    Windows 10 Pro Prieview x64


    Decided not to change it in the end.
      My System SpecsSystem Spec

How can I change system C: drive?
Related Threads
I just bought a new SSD and did a fresh install of windows going from Windows 7 to 8.1. I simply took out my old SSD and put in the new one, and installed windows 8.1 pro from a USB stick onto the new ssd. 2 existing HDDs were left on there, I'm also replacing them but I want to format them...
I've searched a lot on this topic but I have failed to find anything that works. In particular, the suggestion to use option 2 or 3 (registry edit) of a similar tutorial in the win7 forums, does not work for me. Has anyone gotten this to work? Particularly on win 8.1.1? PK
I'm booting off my SSD which is drive C:\ and I have games and programs on an extra hard drive which was origanally drive H:\ but after a restart it switched to I:\ and when I go into Disk Management to change it Drive H:\ isn't there.
hi i am using windows 8 enterprise N i want to change the fonts of right click mouse options and all items on my computer pls tell me how can i change fonts:rolleyes:
Change SYSTEM Language to English in Installation & Setup
Does anyone know if this is possible? To be clear I am not talking about display language or input language as there are many posts about this. Currently my settings are as I want them: Display language : English Input language : English (United States) - French Format : English (United...
Change System Drive on Win 8 Pro Upgrade? in Windows Updates & Activation
I have it activated. I would like to replace the system drive with a new SSD drive and use that in the same computer. I would use an imaging program to backup, replace the drive, and recover to the system to the new SSD. Will that affect my activation status? Many thanks,
I've installed Windows 8 starting the installer from Win8 RP and I've just noticed that it picked up the drive letters from the old system. Now my system drive is Y instead of C , because in the old system that partition was Y. If I try to change the drive letter in the Drive Management it gives...
Eight Forums Android App Eight Forums IOS App Follow us on Facebook