PS C:> $drive = gwmi win32_logicaldisk | where {$_.deviceid -like “c:”}
PS C:> “Free size on C: {0:N2}” -f ($drive.freespace / 1MB) + ” MB”
Free size on C: 237 788,60 MB
… gwmi is an alias for Get-WmiObject commandlet, you can use -computer parameter after call selection if you want check a remote computer (eg.: gwmi win32_logicaldisk -computer server1).