A conventional DVD stores data only on its surface. But holographic storage encodes data as three-dimensional patterns embedded inside a disc, vastly expanding its storage capacity. A long-awaited holographic drive from InPhase of Longmont, CO, is due out late this year; geared to Hollywood studios and large archives, it will cost $18,000. But a few companies, such as General Electric and Sony, are working on holographic storage systems that could be more compatible with existing technologies.
InPhase’s drive stores information in big blasts, 1.4 million bits at a time. That makes data retrieval extremely fast, but it also requires complicated and costly optics. A prototype system from GE, on the other hand, stores information a bit at a time–just like today’s media. That means that GE’s holographic discs could be played on modified Blu-ray players, which could potentially handle old DVDs and CDs, as well.
In the GE technology, the holographic bits–each measuring 0.3 by 5 micrometers–are arrayed in a plane, with dozens of planes layered throughout the disc. Initial versions of the disc will hold 300 gigabytes of data–about six times as much as a Blu-ray disc–and might reach market by 2012. Brian Lawrence, manager of GE’s Optical Polymer Lab, says that the technology should ultimately let a disc the size of a DVD store a terabyte of data. GE faces plenty of competition, however. Besides InPhase and Sony, other companies working on holographic storage include Daewoo and Maxell.
The experimental setup includes a beam splitter (cube at left) that bounces one of the beams off of a mirror (not shown) to ensure that it travels the same distance as the other beam before striking the disc.
Courtesy of General Electric
Forget dating apps: Here’s how the net’s newest matchmakers help you find love
Fed up with apps, people looking for romance are finding inspiration on Twitter, TikTok—and even email newsletters.
How AI is reinventing what computers are
Three key ways artificial intelligence is changing what it means to compute.
These weird virtual creatures evolve their bodies to solve problems
They show how intelligence and body plans are closely linked—and could unlock AI for robots.
We reviewed three at-home covid tests. The results were mixed.
Over-the-counter coronavirus tests are finally available in the US. Some are more accurate and easier to use than others.
Get the latest updates from
MIT Technology Review
Discover special offers, top stories, upcoming events, and more.