As the war rages over what format will make up the next generation of DVDs, signs of an impending battle over their successors are already in the air.
A new type of disc that promises to cram in up to 300 times as much data as today’s DVDs is poised to hit the market, and a similar, rival disc whose data is recorded and read differently is to be released within a few years.
The new discs use a holographic technique to store data in three dimensions. At first they will be used by businesses and governments to back up…
