code: def parse_device_disk(token):
      
      name, token = token.split("[", 1)
      number, flags = token.split("]", 1)
  
      return name, {
          "number": int(number),
          "write_mostly": "W" in flags,
          "faulty": "F" in flags,
          "spare": "S" in flags,
          "replacement": "R" in flags,
      }
docs: Parse a single disk from the header line.
  
      Each disks has at least a device name and a unique number in its array,
      after that could follow a list of special flags:
          (W)  write-mostly
          (S)  spare disk
          (F)  faulty disk
          (R)  replacement disk
      Some are mutually exclusive (e.g. can't be spare and faulty).