Private/Get-LastAvailableDriveLetter.ps1
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function Get-LastAvailableDriveLetter { param() $GetVolume = Get-Volume # Get all available drive letters, and store in a temporary variable. $UsedDriveLetters = @($GetVolume | % { "$([char]$_.DriveLetter)"}) + @(Get-WmiObject -Class Win32_MappedLogicalDisk | %{$([char]$_.DeviceID.Trim(':'))}) $TempDriveLetters = @(Compare-Object -DifferenceObject $UsedDriveLetters -ReferenceObject $( 67..90 | % { "$([char]$_)" } ) | ? { $_.SideIndicator -eq '<=' } | % { $_.InputObject }) # For completeness, sort the output alphabetically $AvailableDriveLetter = ($TempDriveLetters | Sort-Object -Descending) $AvailableDriveLetter[0] } |