code: @Override
  	protected void writeAllocationBlock( int blockIndex ) throws DataStoreException
      {
      	byte[] allocationBlock = serializeAllocationBlock(blockIndex);
          journal.writeMetaDataBlock(AT_HEADER_SIZE+blockIndex*AT_BLOCK_SIZE, allocationBlock);
      }
docs: /*
  (non-Javadoc)
  @see net.timewalker.ffmq4.storage.data.impl.AbstractBlockBasedDataStore#writeAllocationBlock(int)