Writing Scripture out

In Deuteronomy 17 one will read of Moses’ anticipation of the king of Israel. Moses lays out certain guidelines for the king and how he shall act. One such guideline is to write out long-hand in good Hebrew the Pentateuch (or may be just Deuteronomy) on a scroll given to him by a Levitical priest. The king must carry this hand-written copy of the law and study it so that he may learn to fear Yahweh and obey him (Deuteronomy 17:18-19). My question is: what benefit would there be in hand-writing an entire book of the Bible to carry around and study every day? How acquainted would one get and what kind of understanding of a book of the Bible would develop if one were to write it down. Now if one were to do this, he or she would not have to write it down in Greek or Hebrew, though if you knew the languages it might help keep them fresh in your mind to do so, but a good English translation would work, the best would be the one you study and memorize from. Which also leads me to ask, how would writing out the full text of a book help in memorizing the Bible? I am curious as it what people might think about this.