DevNodeClean: Deleting Unused Devices

Recently a Microsoft support agent used a tool that I wasn’t familiar with:  DevNodeClean.

Basically Windows creates a device in registry for every new device that is connected—even if it’s just a shadow copy created during a Windows backup. To see these, in Device Manager, check View > Show Hidden Devices, then look under Storage volume shadow copies:

DevNodeClean 1

Note that some of these, though hidden, may be in use, i.e. they are active shadow copies. To get rid of those that are unused, download DevNodeClean here. From an administrative command prompt, navigate to the x64 subfolder and run

devnodeclean.exe /n

You’ll see a list of devices that would removed:

DevNodeClean 2

Run it again without /n to remove the devices.

Run it a third time with /n to confirm that the devices are gone.

Microsoft KB934234 has more details on what registry entries are created and deleted but recommends using DevNodeClean for Server 2012 (and, presumably, for later versions).

2 thoughts on “DevNodeClean: Deleting Unused Devices

  1. TheDarkSide

    To Enum…

    On Error Resume Next
    const HKEY_LOCAL_MACHINE = &H80000002
    strComputer = “.”
    x = 0
    Set oReg=GetObject(“winmgmts:{impersonationLevel=impersonate}!\\” & strComputer & “\root\default:StdRegProv”)
    strKeyPath = “SYSTEM\ControlSet001\Control\DeviceClasses\{53f5630d-b6bf-11d0-94f2-00a0c91efb8b}”
    oReg.EnumKey HKEY_LOCAL_MACHINE, strKeyPath, arrSubKeys
    For Each subkey In arrSubKeys
    If Not InStr(subkey, “##?#STORAGE#VolumeSnapshot#HarddiskVolumeSnapshot”) = 0 Then
    x = x +1
    End If
    Next
    WScript.Echo “Count ControlSet001 = ” & x
    x = 0
    Set oReg=GetObject(“winmgmts:{impersonationLevel=impersonate}!\\” & strComputer & “\root\default:StdRegProv”)
    strKeyPath = “SYSTEM\ControlSet002\Control\DeviceClasses\{53f5630d-b6bf-11d0-94f2-00a0c91efb8b}”
    oReg.EnumKey HKEY_LOCAL_MACHINE, strKeyPath, arrSubKeys
    For Each subkey In arrSubKeys
    If Not InStr(subkey, “##?#STORAGE#VolumeSnapshot#HarddiskVolumeSnapshot”) = 0 Then
    x = x +1
    End If
    Next
    WScript.Echo “Count ControlSet002 = ” & x

  2. TheDarkSide

    1.

    devnodeclean.exe /r

    2.

    On Error Resume Next
    const HKEY_LOCAL_MACHINE = &H80000002
    strComputer = “.”

    Set oReg=GetObject(“winmgmts:{impersonationLevel=impersonate}!\\” & strComputer & “\root\default:StdRegProv”)
    strKeyPath = “SYSTEM\ControlSet002\Control\DeviceClasses\{53f5630d-b6bf-11d0-94f2-00a0c91efb8b}”
    oReg.EnumKey HKEY_LOCAL_MACHINE, strKeyPath, arrSubKeys
    For Each subkey In arrSubKeys
    If Not InStr(subkey, “##?#STORAGE#VolumeSnapshot#HarddiskVolumeSnapshot”) = 0 Then
    WScript.Echo subkey
    Deletesubkeys HKEY_LOCAL_MACHINE, strKeyPath & “\” & subkey
    End If
    Next

    Sub DeleteSubkeys(reghive, KeyPath)
    Set objReg=GetObject(“winmgmts:{impersonationLevel=impersonate}!\\” & strComputer & “\root\default:StdRegProv”)
    objReg.EnumKey reghive, KeyPath, arrrSubkeys
    If IsArray(arrrSubkeys) Then
    For Each strrSubkey In arrrSubkeys
    DeleteSubkeys reghive, KeyPath & “\” & strrSubkey
    Next
    End If
    objReg.DeleteKey reghive, KeyPath
    End Sub

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