判斷磁碟機是否存在 DriveExists Method

                  Function ReportDriveStatus(drv)
   Dim fso, msg
   Set fso = CreateObject("Scripting.FileSystemObject")
   If fso.DriveExists(drv) Then
      msg = ("Drive " & UCase(drv) & " exists.")
   Else
      msg = ("Drive " & UCase(drv) & " doesn't exist.")
   End If
   ReportDriveStatus = msg
End Function

'https://msdn.microsoft.com/en-us/library/t565x0f1(v=vs.84).aspx
'	https://social.msdn.microsoft.com/Forums/vstudio/en-US/dc854317-1a72-4f35-9112-91567b5a08e0/how-to-check-if-a-drive-exists-using-vb2010?forum=vbgeneral