code: func (r *DiskSubresource) String() string {
  	p := diskPathOrName(r.data)
  	if p == "" {
  		p = "<unknown>"
  	}
  	return fmt.Sprintf("%s (%s)", r.Subresource.String(), p)
  }
docs: // String prints out the disk sub-resource's information including the ID at
  // time of instantiation, the path of the disk, and the current device
  // key and address.