You can try this:
Get-WmiObject -Class win32_Logicaldisk -ComputerName localhost |
where {($_.DriveType -eq 3 -or $_.DriveType -eq 2) -and $_.FileSystem -ne $null } |
Select -Property
@{Name="Volume";Expression = {$_.DeviceID -replace ":",""}},
@{Name="Free";Expression = { "{0:N0}%" -f (($_.FreeSpace/$_.Size) * 100) } }
solved power shell script to get drive space ( percentage used and free ) [duplicate]