ultra-DVD stores 10,000 GB of data

A DVD that can store up to 2,000 films could usher in an age of 3D TV and ultra-high definition viewing, scientists say. The ultra-DVD is the same size and thickness as a conventional disc, but uses nano-technology to store vast amounts of information.

Scientists believe it could be on sale. One disc could back up the memory of a computer or record thousands of hours of film.

The breakthrough comes from Swinburne University of Technology, Melbourne, Australia, where scientists created a prototype using 'nano rods' - tiny particles of gold too small to see - and polarised light, in which the light waves only flow in one direction.

Professor Min Gu, whose findings appear in the journal Nature, said: 'We were able to show how nano-structured material can be incorporated on to a disc to increase data capacity without increasing the size of the disc.'

A DVD can hold up to 8.5 gigabytes of information, enough for a movie, several special features and an alternative soundtrack.

Blu-ray discs, which were designed to replace them, can store 50GB, enough for a film and extra features in high definition.

But ultra-DVDs will be able to store ten terabytes - or 10,000GB.

A conventional DVD records music, pictures and computer files as digital code - a series of ones and zeroes. The code is written as a series of pits under the clear surface of the disc and is read by a DVD player's laser.

The technology could help usher in an age of 3D TV or ultra-high definition.

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How to watch TV on your PC

Feature Watching TV used to be a passive affair: you sat back and watched whatever happened to be on. These days, passivity is passé. Digital Video Recorder (DVR) set-top boxes can pick up programmes beamed out from a terrestrial transmitter, sent via satellite or pumped down a cable and save them on a hard drive so you begin watching five minutes after the show started or at any other time.

You can do all this on a PC too. Getting TV on a PC is just a matter of plugging in one or more TV tuners, either as an internal add-in card or a USB clip-on, and running the control software. While your computer's screen might not be a sharp or as big as the telly in your living room, having TV on your PC does mean you can keep an eye on what's happening in the world while you're at work or at play. It's a doddle to archive recorded shows to DVD, and network connectivity means you can watch on any computer in any room in the house or anywhere outside while you are on vacation.

Hardware:

Picking a TV tuner for your PC can be a confusing task as you'll be faced with a stack of choices and a host of acronyms and abbreviations. The first choice: analogue, digital or both - the so-called hybrid tuner? When we reviewed HP's IQ770 PC, which uses Windows Vista, we found that the analogue TV tuner provided a handful of fuzzy TV stations that were unwatchable. To our mind, the appeal of analogue TV is past, particularly with the upcoming end of analogue broadcasts in the UK and other countries.

TV tuner specialist Hauppauge told us: "Analogue provides two key features: the ability to capture from analogue sources, such as VCRs, and flexibility. USB tuners are often used in more than one place, and digital signals may not be available in all of them."

Indeed, we've used Elgato's EyeTV Hybrid tuner to digitise old VHS tapes that aren't available on DVD.

If you want to watch one digital channel while you record another then you need two tuners. However, there's nothing to stop you going multiple tuners. Windows Media Center is designed to run two tuners. However, we're told that you can hack it to run at least six tuners, should you feel the need. Multi-channel, multi-monitor display system, anyone?

souce: register