I have scripted FreeSpace.vbs to retrieve the freespace on each of my hard drives.

If you just want to display the information, open a CMD.EXE prompt and type:

cscript //nologo <FolderPath>\FreeSpace.vbs

You will receive a display like the following, where the free space is in megabytes.

C: 15345
D: 31329

If you wanted to process the results in a batch file:

for /f "Tokens=1*" %%a in ('cscript //nologo <FolderPath>\FreeSpace.vbs') do (                               set drive=%%a                               set /a freespace=%%b                               ...                               ...                              )
FreeSpace.vbs contains:
strComputer = "."                              Set objWMIService = GetObject("winmgmts:" _                                  & "\{impersonationLevel=impersonate\}!\\" & strComputer & "\root\cimv2")                              Set colDisks = objWMIService.ExecQuery _                                  ("Select * from Win32_LogicalDisk Where DriveType = 3")                              For Each objDisk in colDisks                              Wscript.Echo objDisk.DeviceID  & " " _                                  & Int (objDisk.FreeSpace / 1024 / 1024)                              Next