Unmapping Network Drives

June 27th, 2015 by and tagged , , , , ,

Unmapping network drives with PowerShell should be easy, and it is, but with some caveats. If you always create your network drive mappings with New-PSDrive, then it’s easy to unmap them with Remove-PSDrive. But if some of them are created with Group Policy, some of them with the legacy “net use” commands, some of them with New-SmbMapping, and some with New-PSDrive, it’s really not that easy to fully clean up the list of mapped drives. I’ve used a variety of techniques over the years to map and unmap drives, and I’ve finally come to the conclusion that using New-PSDrive and Remove-PSDrive is the cleanest way for most things. However, if you’ve got a mix of mapped drives, created with more than one method, here’s a script to remove them all.

Unmaps network drives
Unmapdrives removes all currently mapped network drives. It's smart enough to 
remove drives mapped with "net use", "New-SmbMapping" and "New-PSDrive". This 
cmdlet accepts no parameters and assumes -Force for all unmappings. 

Unmaps all currently mapped network drives 

    Author: Charlie Russel
 Copyright: 2015 by Charlie Russel
          : Permission to use is granted but attribution is appreciated
   Initial: 06/27/2015 (cpr)

# Build a dynamic list of currently mapped drives
$DriveList = Get-WMIObject Win32_LogicalDisk `
     | Where-Object { $_.DriveType -eq 4 }

# Don't bother running this if we don't have any mapped drives
 if ($DriveList) { 
    $SmbDriveList = $DriveList.DeviceID
 } else {
    Write-Host "No mapped drives found"

Write-host "Unmapping drive: " -NoNewLine
Write-Host $SmbDriveList
Write-Host " "

Foreach ($drive in $SmbDriveList) {
    $psDrive = $drive -replace ":" #remove unwanted colon from PSDrive name
    Remove-SmbMapping -LocalPath $Drive -Force -UpdateProfile
    If ( (Get-PSDrive -Name $psDrive) 2>$Null ) {
       Remove-PSDrive -Name $psDrive -Force
Write-Host " "

# Report back all FileSystem drives to confirm that only local drives are present. 
Get-PSDrive -PSProvider FileSystem

This is the simple form of a more generalized script that can accept a parameter of either -All or a list of mapped drive letters to remove. (And yes, unmap isn’t an approved verb. But this script started out life many, many years ago as a batch file (“unmapdrives.cmd”), so it’s still got the same base name it has always had, because that’s what my fingers remember!)

Posted in PowerShell, WMI | 4 Comments »

4 Responses to “Unmapping Network Drives”

  1.   Edwin Says:

    Would you have an explanation for the following?

    When i map a new persistent ps drive i somethimes get errors if i try to remove it although my command syntax is correct

    If i specify the drive letter in capitals all works ( see below )

    new-psdrive -name G -psprovider filesystem -root \\\c$ -persist

    PS C:\> get-psdrive G

    Name Used (GB) Free (GB) Provider Root CurrentLocation
    —- ——— ——— ——– —- —————
    G 33,20 216,80 FileSystem \\\c$

    PS C:\> remove-psdrive G

    drive is gone now

    Now if i specify the drive letter in lowercase the map works but when i do a get-psdrive it shows 2 G drives ( one in uppercase and one in lowercase ).

    PS C:\> new-psdrive -name g -psprovider filesystem -root \\\c$ -persist

    PS C:\> get-psdrive g

    Name Used (GB) Free (GB) Provider Root CurrentLocation
    —- ——— ——— ——– —- —————
    g 33,22 216,78 FileSystem \\\c$
    G 33,22 216,78 FileSystem G:\

    PS C:\> remove-psdrive g
    remove-psdrive : Cannot find drive. A drive with the name ‘G’ does not exist.
    At line:1 char:1
    + remove-psdrive g
    + ~~~~~~~~~~~~~~~~
    + CategoryInfo : ObjectNotFound: (G:String) [Remove-PSDrive], DriveNotFoundException
    + FullyQualifiedErrorId : DriveNotFound,Microsoft.PowerShell.Commands.RemovePSDriveCommand

    Is this a bug or can you simply not specify the to be mapped drive letter in lowercase ? Thought about asking someone with a bit more experience in this

    •   Charlie Russel Says:

      I’m certainly NOT seeing this behaviour in PowerShell v5, so I can’t confirm or deny that it’s a problem in some earlier version. There are a couple of things that can cause errors here, though I don’t believe that uppercase v. lowercase should make any difference at all. However, if you’re logged in AS Administrator, that is a different set of PSDrives than logged in normally. Trying to remove a PSDrive created in a normal window requires that the Remove-PSDrive command be run from a normal window, not an elevated one.

      PowerShell should never be case sensitive unless you explicitly specify case-sensitivity in a cmdlet where that’s appropriate (such as Select-String).

  2.   Brian Says:

    Is it possible to remove all mapped drives with the exception of the HomeDrive provided by Active Directory? We map homedrives based of the Active Directory attribute and would prefer that this drive be mapped still.

    •   crussel Says:

      Sure. Just skip that drive letter. So, if you look in the script you’ll see:
      If ( (Get-PSDrive -Name $psDrive) 2>$Null )
      Just change that to add an additional condition to exclude whatever the drive letter is that you use.