A novel disc the size of a DVD can hold more than 1 million gigabits—roughly as much as is transmitted per second over the entire world’s Internet—by storing data in three dimensions as opposed to two, a new study finds.Optical discs such as CDs and DVDs encode data using a series of microscopic pits. These pits, and the islands between them, together represent the 0s and 1s of binary code that computers use to symbolize information. CD, DVD, and Blu-ray players use lasers to read the data encod...