code: def save_linked_hdds_info(self):
          
  
          hdd_table = []
          if self.linked_clone:
              if os.path.exists(self.working_dir):
                  hdd_files = yield from self._get_all_hdd_files()
                  vm_info = yield from self._get_vm_info()
                  for entry, value in vm_info.items():
                      match = re.search("^([\s\w]+)\-(\d)\-(\d)$", entry)  # match Controller-PortNumber-DeviceNumber entry
                      if match:
                          controller = match.group(1)
                          port = match.group(2)
                          device = match.group(3)
                          if value in hdd_files and os.path.exists(os.path.join(self.working_dir, self._vmname, "Snapshots", os.path.basename(value))):
                              log.info("VirtualBox VM '{name}' [{id}] detaching HDD {controller} {port} {device}".format(name=self.name,
                                                                                                                         id=self.id,
                                                                                                                         controller=controller,
                                                                                                                         port=port,
                                                                                                                         device=device))
                              hdd_table.append(
                                  {
                                      "hdd": os.path.basename(value),
                                      "controller": controller,
                                      "port": port,
                                      "device": device,
                                  }
                              )
  
              if hdd_table:
                  try:
                      hdd_info_file = os.path.join(self.working_dir, self._vmname, "hdd_info.json")
                      with open(hdd_info_file, "w", encoding="utf-8") as f:
                          json.dump(hdd_table, f, indent=4)
                  except OSError as e:
                      log.warning("VirtualBox VM '{name}' [{id}] could not write HHD info file: {error}".format(name=self.name,
                                                                                                                id=self.id,
                                                                                                                error=e.strerror))
  
          return hdd_table
docs: Save linked cloned hard disks information.
  
          :returns: disk table information