Magnetic disks can't quite manage 40Gb (gigabits) per square inch, but InPhase Technologies has achieved 515Gb using holographic disk tech.Some seriously specious hard drives are on the way.The concept has been around for several decades but the optical storage technology has only become feasible in the last few years.
Chief technology officer Kevin Curtis said previous tests carried out in April 2005 had only achieved 200Gb per square inch.
[BBC News]