PowerShell for Windows Admins

Jan 12 2010   2:41AM GMT

Disks Part 4: Mount points

Richard Siddaway Richard Siddaway Profile: Richard Siddaway

We have seen how to discover our physical and logical disks.  In a quick digression I want to cover Mount Points.  These allow us to mount the volume into an empty folder in the file system rather than having a new drive. They are useful when we have lots of volumes and need to conserve drive letters.

Get-WmiObject -Class Win32_MountPoint | 
where {$_.Directory -like ‘Win32_Directory.Name="C:\\Data*"’} | 
foreach {
    $vol = $_.Volume
    Get-WmiObject -Class Win32_Volume | where {$_.__RELPATH -eq $vol} | 
    Select @{Name="Folder"; Expression={$_.Caption}}, 
    @{Name="Size (GB)"; Expression={"{0:F3}" -f $($_.Capacity / 1GB)}},
    @{Name="Free (GB)"; Expression={"{0:F3}" -f $($_.FreeSpace / 1GB)}},
    @{Name="%Free"; Expression={"{0:F2}" -f $(($_.FreeSpace/$_.Capacity)*100)}}

Our win32_MountPoint class only gives us directory and volume ID information.  if we want more we have to link to the Win32_Volume class.

As we know where we have mounted our volumes we can filter on that folder – note the use of c:\\data  – the \\ is a WMI syntax to escape the \.

For each mount point we find a volume with the correct ID.  I’ve use __RELPATH in the filter as it takes the same syntax as the ID in win32_mountpoint so we don’t need to do any processing.  Once we have our volume we can format the data in the way we have seen previously.

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