if err != nil {
		return format{}, err
	}
	var f format
	err = json.Unmarshal(formatJSON, &f)
	if err != nil {
		return format{}, err
	}

	return f, nil
}

func getDiskLocation(f format) (string, error) {
	for i, set := range f.XL.Sets {
		for j, disk := range set {
			if disk == f.XL.This {
				return fmt.Sprintf("%d-%d", i, j), nil
			}
		}
	}