code: @Override
  	public boolean hasNext() {
  		if (!isForward) {
  			currentRec = currentRec - pointerSize;
  			isForward = true;
  		}
  		return currentRec > 0 || blk.number() > 0;
  	}
docs: Determines if the current log record is the earliest record in the log
  file.
  
  @return true if there is an earlier record