code: public final void save(File file) throws IOException {
          _entryFile = file;
          Chronos c = new Chronos();
          DataWriter out = new FastDataWriter(file);
  
          try {
              out.open();
  
              // Save entry head
              out.writeLong(STORAGE_VERSION); // write the entry file version
              out.writeLong(_minScn);
              out.writeLong(_maxScn);
              out.writeInt(size());
  
              // Save entry body
              saveDataSection(out);
  
              // Save entry tail.
              out.writeLong(_minScn);
              out.writeLong(_maxScn);
          } finally {
              out.close();
          }
          
          if(_log.isInfoEnabled()) {
              _log.info("Saved entry: minScn=" + _minScn + " maxScn=" + _maxScn + " size=" + size() + " file=" + file.getName() + " in " + c.getElapsedTime());
          }
      }
docs: Saves to a file.
  
  @param file
  @throws IOException