Obvious: Avatar is the most pirated Blu-ray Disc
According to BitTorrent blog Torrentfreak, over 200,000 copies of the Avatar Blu-ray Disc have been been downloaded in just four days since the disc's release. That's only the Blu-ray Disc version of the film; significantly more copies of the DVD release have been downloaded.
This is every bit a testament to the growing popularity of Blu-ray as it is of Avatar's popularity. The Blu-ray Disc version contains over 10 gigabytes of data, which is a significant amount to download on any broadband connection.
I wouldn't be too worried about the piracy digging into sales of the Blu-ray Disc, though. In the days since the film was released, over 2.7 million copies have been purchased.
— Will Greenwald