Disk Management Blocking Use Of Mode "H"


  1. Posts : 61
    W7 Home 64 / W7 Pro 64
       #1

    Disk Management Blocking Use Of Mode "H"


    I'm trying to change the defaulted letter "I" and assign "H" to an external disk drive. But Disk Management is not showing "H" as available (see attachment Mode Letter Problem - 1). That is probably because in Computer -> Devices it is showing "H" as being assigned to a "Removable Disk" (see attachment Mode Letter Problem - 2). But I did not put a disk in there at "H" and then detach it. And the left frame in Explorer showing all of the disks does not show "H" assigned. It's possible that many months ago something may have been defaulted and briefly assigned "H" but if so that was a very long time ago.
    How do I fix this?
    Attached Thumbnails Attached Thumbnails Disk Management Blocking Use Of Mode "H"-mode-letter-problem-1.jpg   Disk Management Blocking Use Of Mode "H"-mode-letter-problem-2.jpg  
      My Computer


  2. Posts : 6,379
    Windows 7 Ultimate x64
       #2

    Download USBDeView. Then watch my video. View any installed/connected USB device on your system

    (Chose 1080p and full screen).

      My Computer


  3. Posts : 61
    W7 Home 64 / W7 Pro 64
    Thread Starter
       #3

    Thank you F22 Simpilot. I installed USBView but it does not help. It shows four (4) drive letters all on one device (see attached). And I don't even know what that device is. I use "F" for USB disk for backups (disconnected now); "G" is for a USB disk on a different computer (on the LAN); "E" is the same story as "H" - it may have been automatically default assigned once but that was a long time ago.

    Any ideas?
    Attached Thumbnails Attached Thumbnails Disk Management Blocking Use Of Mode "H"-display-1.jpg  
      My Computer


  4. Posts : 15,583
    7 X64
       #4

    HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices

    look in the right pane for \DosDevices\H:

    and delete it
      My Computers


  5. Posts : 561
    Windows 7 Home Premium x64
       #5

    NewW7User said:
    ... I installed USBView but it does not help. It shows four (4) drive letters all on one device (see attached). And I don't even know what that device is. Any ideas?
    This is usually an SD card reader that can support up to 4 cards, but without any cards inserted at present.
      My Computers


  6. Posts : 61
    W7 Home 64 / W7 Pro 64
    Thread Starter
       #6

    Bree,
    I didn't get this computer new and don't have a card reader attached to it (unless it's hidden under the covers).

    SIW2,
    I came across some warnings on a website about HKLM Mounted Devices entries being cross-linked to other keys and therefore deleting is a big risk in just deleting them. Is that not correct? Oddly (or interestingly) - the data entries in Mounted Devices for the four letters that I noted above are identical.
      My Computer


  7. Posts : 6,379
    Windows 7 Ultimate x64
       #7

    You could always A) create a system restore point and B) right click that registry key and export. I'd do both. Besides, you should have periodic disk clones anyway.
      My Computer


 

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