Warner Brothers’ The Dark Knight has eclisped Iron Man to become the fastest selling Blu-ray Disc movie of all time.

Approximately 600,000 Blu-ray copies of the movie sold on the first day in the US, Canada and UK.

This represent 20 per cent of the total three million copies sold during the first 24 hours.

An estimated one-sixth of the high-def discs were bought in the UK, with most of the remainder presumably being snapped up in the US.

Warner Brothers is now predicting that it will sell one million BDs by the weekend.

Iron Man’s day one record had stood at 250,000 BDs.

Not surprisingly the studio has been quick to talk up what the figures mean for Blu-ray.

Kevin Tsujihara, president of Warner Brothers Home Entertainment, said: "Numbers like these in this economic environment firmly establish Blu-ray as where consumers are headed."

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