@@dh = {"type" => "device_name", "devicetype" => "device_type", "id" => "location", "present" => "present",
    "filename" => "filename", "startconnected" => "start_connected", "autodetect" => "auto_detect", "mode" => "mode",
    "connectiontype" => "mode", "size" => "size", "free_space" => "free_space", "size_on_disk" => "size_on_disk",
    "generatedaddress" => "address", "disk_type" => "disk_type"}