' Defragment a Volume
strComputer = "."
Set objWMIService = GetObject("winmgmts:" _
& "{impersonationLevel=impersonate}!\\" & strComputer & "\root\cimv2")
Set colVolumes = objWMIService.ExecQuery _
("Select * from Win32_Volume Where Name = 'D:\\'")
For Each objVolume in colVolumes
errResult = objVolume.Defrag()
Next