Make DisMount-DiskImage work

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TL;DR – DisMount-DiskImage doesn’t work the same it did in Windows Server 2012 R2, here is how to make it work in Windows 10 and Server 2016.

Dirty Boy

OK, with the release of Windows 1709, I’ve been downloading all sorts of *.ISO images from MSDN to try out the latest features, kits, and support utilities. As I develop scripts to auto mount and extract the contents, sometimes I leave the ISO images mounted, so I’ll need to clear everything off before I begin a new test run.

I developed a new powershell script function to do all of this for me: Dismount-Everything. I had the VHDX part working, but somehow the DVD part wasn’t working well.

I specifically wanted to dismount ISO images, even though I might now recall the path where they came from, even though the drive letter should be easily visible.

Blogs

I went to a couple of blog sites to find out how to dismount ISO images, and got some hits.

https://rcmtech.wordpress.com/2012/12/07/powershell-mounting-and-dismounting-iso-images-on-windows-server-2012-and-windows-8/

https://superuser.com/questions/499264/how-can-i-mount-an-iso-via-powershell-programmatically

But on the superuser site, the author suggests that you should be able to take the output from get-volume and pipe it into Get-DiskImage, but that was not working for me.

Get-Volume [Drive Letter] | Get-DiskImage | Dismount-DiskImage

No matter what, Get-DiskImage didn’t like the volume Path.

Get-Volume would output:

\\?\Volume{1f8dfd40-b7ae-11e7-bf06-9c2a70836dd4}\

but Get-DiskImage would expect:

\\.\CDROM1

Well, Windows NT will create virtual shortcuts between long path names like \\?\volume and something more readable like \\.\CDROM1, so I assumed there was an association there.

Well after testing I found out that this command didn’t work:

get-diskimage -devicepath \\?\Volume{1f8dfd40-b7ae-11e7-bf06-9c2a70836dd4}\

But this command did:

get-diskimage -devicepath \\?\Volume{1f8dfd40-b7ae-11e7-bf06-9c2a70836dd4}

Turns out that I just needed to strip out the trailing \.

Easy!

Code

Get-Volume | 
  Where-Object DriveType -eq 'CD-ROM' |
  ForEach-Object {
    Get-DiskImage -DevicePath  $_.Path.trimend('\') -EA SilentlyContinue
  } |
  Dismount-DiskImage

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