The wizards and witches of Hogwarts have obviously been waving their magic wands to get both kid and adult Muggles to rent out the novel.
The Chamber of Secrets was the top children's book when it first came out, and the film had the most successful opening weekend of any film in the history of UK cinema.
JK not most popular author
And there are likely to be even more records broken.
The DVD - which is out on Friday - could become the most popular ever, because so many people have pre-ordered it.