Avatar on Blu-RayJames Cameron’s “Avatar” does it again. After becoming the highest-grossing movie of all time at movie theaters, the film broke records when it dropped on DVD and Blu-Ray last week.

In just four days, the home video sold 2.7 million Blu-Ray discs, becoming the highest selling unit of all-time. The previous record holder, “The Dark Knight,” has sold 2.5 million Blu-rays since its debut 16 months ago.

Since April 22, it has sold four million standard DVDs and the 2.7 million Blu-Rays, making it the biggest DVD launch of the year. The previous mark was help by “The Twilight Saga: New Moon”, which sold 4 million Blu-rays and DVDs.

The L.A. Times says: “The huge debut for ‘Avatar’ on home video dispels concerns that consumers wouldn’t want to see it on a 2-D home television after most watched it in theaters in 3-D. Eighty-three percent of ‘Avatar’s’ $746.4-million domestic gross has come from theaters with 3-D screens. More than 70% of its $1.975-billion international gross has come from 3-D.”

Fox signed deals with kiosk renter Redbox and DVD-by-mail firm Netflix to keep “Avatar” and all of the studio’s future releases off the services until 28 days after they go on sale.

No announcement has been made regarding a 3-D DVD release, but a Fox spokesman said one can be expected in the future