PowerShell: Get First Open Drive Letter

Three lines of code to return the first in an array of available drive letters in the correct format for piping to New-PSDrive.

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$letters = 65..90 | ForEach-Object{ [char]$_ + ":" } $taken = Get-WmiObject Win32_LogicalDisk | select -expand DeviceID $avail = ((Compare-Object -ReferenceObject $letters -DifferenceObject $taken)[1].InputObject).Replace(":","")