By switching from red lasers to blue lasers with a finer beam, the storage capacity of DVDs went from 4.7GB to 25GB to allow Blu-ray discs to hold movies encoded in HD resolutions and beyond. Last week, researchers from the University of Southampton in the UK revealed the next big breakthrough in disc storage…
Source: Gizmodo – Researchers Think They Figured Out How to Squeeze 500TB on a DVD-Sized Disk