Windows 10: Drive letter for D, E, Y and Z are incorrect and I can't change them.

  1.    27 Feb 2017 #1

    Drive letter for D, E, Y and Z are incorrect and I can't change them.

    This all started with 10 needing more space than Microsoft stated. I cloned the original drive and adjusted the space accordingly. I had problems but finally got it to boot to but my drive letters for; D (Program Files), E (Documents), Y (Temp) and Z (BackUps) are moved around to; F (Program Files), G (Documents), D (Temp) and E (BackUps). I can access Control Panel but I can't access any Command Prompts, Regedit or Device Manager even though C:\ is the Windows drive. I get a message that "Windows cannot find C:\Windows\System32\diskmgmt.msc when I try to access Disk Management. I tried right clicking and opening properties and locating it manually and I get the same message. I've tried changing the drive letters from the Command Prompt using 10's install disk and Advanced under repairs. I've tried using Falcon Four UBCD and accessing the Registry from it. Neither one works.
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  2.    01 Mar 2017 #2

    You cannot change the Windows OS drive letter once it has been assigned by Windows during the install or clone. You would have to reinstall Windows cleanly to solve the problem. Try a clean install of Windows to a new drive, then attach the old drive as a secondary and assign the drive letters you like.
    Once you can browse the C: drive and access Disk Management, Or you can use a 3rd party app like Minitool Partition Wizard , you can change the drive letter for all the other drives easily.
      My ComputerSystem Spec

  3.    02 Mar 2017 #3

    Just wondering.. what's the significance of F:\Program Files? I hope you haven't used a registry editor to change the ProgramFilesDir key(s) in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion

    That would make life hard- it's not supported.

    Similarly what's Temp - provided what's in that is entirely material under your control and not OS temp files, that's fine.
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  4. Berton's Avatar
    Posts : 5,265
    Win10 Home and Pro, Win10 Insider Preview, WinXP Home Premium, Linux Mint
       02 Mar 2017 #4

    Also note that for the last few versions of Windows drive letter Z: has been used for the first Mapped Network drive then works back up the alphabet for additional such drives. I have Z: and Y: assigned for my 2 NAS drives. If never mapping such drives the letters can be used for other drives and I've noticed on a few computers that Z: was a partition used by the OEMs when installing.
      My ComputerSystem Spec

  5.    02 Mar 2017 #5

    I ended up copying the backup back afteI deleted the mapped drives. Everything seems to be working fine.
      My ComputerSystem Spec

  6.    03 Mar 2017 #6

    Glad to hear it.
      My ComputerSystem Spec


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