BBC Homepage World Service Education
BBC Homepagelow graphics version | feedback | help
BBC News Online
 You are in: Sci/Tech
Front Page 
World 
UK 
UK Politics 
Business 
Sci/Tech 
Health 
Education 
Entertainment 
Talking Point 
In Depth 
AudioVideo 
Wednesday, 28 June, 2000, 09:21 GMT 10:21 UK
Big digital disk debuts
CD close-up
FMD might one day replace both DVD and CD
By BBC News Online internet reporter Mark Ward

Digital disks are set for a big boost in capacity.

By the end of the year, US firm Constellation 3D claims that it will be selling a new generation disk it hopes will replace existing DVDs

Initially the new disks will have 10 times the capacity of a DVD, and by the middle of next year, the company says it will be making disks with 20 times more storage room.

Constellation claims that existing DVD drives will be able to read its disks after only a slight modification.

The company says it can squeeze a lot more data on to a disk because it has found a way to record information on multiple layers within the disk.

Every layer holds the equivalent of an existing DVD - around five gigabytes of data.

Currently, Constellation has made disks with 10 layers but expects that as the technology improves it will be able to make 100-layer disks.

Groovy space

On a DVD, information is encoded in the form of a series of pits and spaces, called "lands", in a groove spiralling out from the centre of the disc.

A laser reads the sequence of different length pits and lands, and this is converted into a stream of digital information.

DVDs use more powerful red lasers than those in a CD player. This means that the pits and spaces can be smaller and more information can be crammed on to the disk.

By contrast, the new Constellation disks overlay the pits and lands with a fluorescent material which emits light when struck by the laser.

This incoherent light has a slightly different wavelength to that of the laser beam and can travel through the layers of the disk undisturbed.

"The fluorescent compounds can be tailored to have different properties," said Patrick Maloney, senior vice president at Constellation 3D. "They can be made to play once or you can make it last 150 years."

Moving pictures

The new disks will take time to reach consumers, however. The first users are likely to be film studios in need of storage media with enormous capacities.


Buzz Pixar
Some cinema goers saw a digital version of Toy Story 2 Disney/Pixar
Mr Maloney said Constellation was initially talking to film studios such as Lucasfilm and Disney who are starting to make digital versions of films that are stored like any other computer file.

Last year, some cinema-goers who went to see Toy Story 2 saw a digital version rather than one printed on film.

Eventually, Constellation expects computer makers to bring out machines with hybrid drives that can read CDs, DVDs and its own disks.

Search BBC News Online

Advanced search options
Launch console
BBC RADIO NEWS
BBC ONE TV NEWS
WORLD NEWS SUMMARY
PROGRAMMES GUIDE
See also:

04 Oct 99 | Sci/Tech
New era in data storage promised
20 Jan 00 | Entertainment
Movies on the web
Internet links:


The BBC is not responsible for the content of external internet sites

Links to more Sci/Tech stories are at the foot of the page.


E-mail this story to a friend

Links to more Sci/Tech stories