Const HARD_DISK = 3
 
strComputer = "."
Set objWMIService = GetObject("winmgmts:" _
    & "{impersonationLevel=impersonate}!\\" & strComputer & "\root\cimv2")
 
Set colDisks = objWMIService.ExecQuery _
    ("Select * from Win32_LogicalDisk Where DriveType = " & HARD_DISK & "")
 
For Each objDisk in colDisks
Wscript.Echo objDisk.DeviceID & " " & mid((objDisk.size)/1048576,1,10) & " " & mid((objDisk.Freespace)/1048576,1,10)
Next