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:

    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


    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 : 2,846
    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?

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