'Creates path object for the given disk.
:param ds_name: name of the datastore where disk is stored
:param folder_path: absolute path of the folder containing the disk
:param disk_name: name of the virtual disk'

def __init__(self, ds_name, folder_path, disk_name):

    self._descriptor_file_path = ('%s%s.vmdk' % (folder_path, disk_name))
    self._descriptor_ds_file_path = self.get_datastore_file_path(ds_name, self._descriptor_file_path)
