PowerShell: Remove a Drive Mount/Letter (More win32)

I’ve got a server with about 300 volumes on it and I obviously can’t use drive letters so I’ve got a bunch of mount points which works great the problem is that after the first reboot the automount kicked in and gave some of those volumes drive letters. Now all of my drive letters are taken up!

I don’t really want to use the storage manager to remove the 20 or so volume labels so I started to dig in to a PowerShell method and come to find out PSCX has a method but that was the only way. I’m not a huge fan of modules (didn’t want to deploy that to my server) so I figured if they can do it so can I.

With a little digging I found the win32 api that allows us to remove mount points (a drive letter is still a mount point) and this was easier than I would have imagined.

If you’ve read my Getting Started with Win32 API then this will make perfect sense to you.

Add-Type @"
using System;
using System.Runtime.InteropServices;

public class MountPoint
[DllImport("kernel32.dll", CharSet=CharSet.Auto, SetLastError=true)]
public static extern bool DeleteVolumeMountPoint(string mountPoint);


Once I did that for each drive I needed to remove I loaded up DiskPart and typed AutoMount Disable which prevents drives from automounting at boot.
That’s all there is to it!


About jrich

I am the Solutions Architect for Apex Learning in Seattle WA. I've been working with computers since I was 13. Started programming when I was 14. Had my first IT job as tech support at an ISP at the age of 15 and became a network admin at the age of 17. Since then I've worked at a variety of small to mid size companies supporting, maintaining and developing all aspects of IT. Mostly working with Windows based networks but have recently been working with Solaris system as well. I created this blog mostly as a place for me to take my own notes, but also share things that I had a hard time finding the info for.

Posted on April 27, 2012, in WMF (Powershell/WinRM) and tagged , , , , , , , , . Bookmark the permalink. Leave a comment.

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