Researchers develop 100G-byte optical disc

A team of researchers at Taipei's National Taiwan University (NTU) have developed a prototype rewritable optical disc that can store 100G bytes of information and is compatible with existing CD and DVD technology. The new disc offers far more storage capacity than existing DVD-ROMs, which can store up to 17G bytes.

The 100G-byte disc is expected to become commercially available in 2004, when applications such as high-definition TV will create demand for larger storage capacities, said Din Ping Tsai, the professor at NTU who led the research team, in an interview.

The disc, which was developed with the backing of Taiwanese optical disc maker Ritek Corp. and Taiwan's National Science Council (NSC), is able to achieve a higher density of data and greater storage capacity than existing CDs and DVDs through the use of near-field optics, Tsai said.

Unlike other recent advances in optical storage that require the use of blue lasers, the 100G-byte disc developed by the NTU team works with the read-write heads found in CD and DVD players that employ red lasers, which have a longer wavelength than blue lasers.

Near-field optics technology increases the disc's storage capacity by allowing a red laser to make recording marks smaller than its diffraction limit, Tsai said. These smaller marks can be spaced more closely together, increasing both storage density and capacity.

To achieve this, two layers have been added to the near-field region of the recording media, Tsai said. The first layer is a transparent layer, called a spacer, that is between 10 nanometers to 20 nanometers thick. The second layer, the active layer, interacts with the laser's focusing spot to create a very small mark size, he said.

Because the interaction between the laser and the recording media takes place in the near-field region, there is no diffraction limit, Tsai saidThe only hardware change that is necessary to accommodate the disc's higher storage capacity is an upgrade to the player's chipset that supports the smaller mark size, Tsai said. The disc can also be used with players that do not have an upgraded chipset but the mark size would not be as small, he said.

Research on the near-field optical disc began in 1998 and has been so far funded to the tune of NT$30 million (US$871,000) by both Ritek and the NSC, he said.

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.
Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Sumner Lemon

PC World
Show Comments

Cool Tech

Toys for Boys

Family Friendly

Stocking Stuffer

SmartLens - Clip on Phone Camera Lens Set of 3

Learn more >

Christmas Gift Guide

Click for more ›

Brand Post

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Aysha Strobbe

Microsoft Office 365/HP Spectre x360

Microsoft Office continues to make a student’s life that little bit easier by offering reliable, easy to use, time-saving functionality, while continuing to develop new features that further enhance what is already a formidable collection of applications

Michael Hargreaves

Microsoft Office 365/Dell XPS 15 2-in-1

I’d recommend a Dell XPS 15 2-in-1 and the new Windows 10 to anyone who needs to get serious work done (before you kick back on your couch with your favourite Netflix show.)

Maryellen Rose George

Brother PT-P750W

It’s useful for office tasks as well as pragmatic labelling of equipment and storage – just don’t get too excited and label everything in sight!

Cathy Giles

Brother MFC-L8900CDW

The Brother MFC-L8900CDW is an absolute stand out. I struggle to fault it.

Luke Hill

MSI GT75 TITAN

I need power and lots of it. As a Front End Web developer anything less just won’t cut it which is why the MSI GT75 is an outstanding laptop for me. It’s a sleek and futuristic looking, high quality, beast that has a touch of sci-fi flare about it.

Emily Tyson

MSI GE63 Raider

If you’re looking to invest in your next work horse laptop for work or home use, you can’t go wrong with the MSI GE63.

Featured Content

Product Launch Showcase

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?