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

Brand Post

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

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.

Laura Johnston

MSI GS65 Stealth Thin

If you can afford the price tag, it is well worth the money. It out performs any other laptop I have tried for gaming, and the transportable design and incredible display also make it ideal for work.

Andrew Teoh

Brother MFC-L9570CDW Multifunction Printer

Touch screen visibility and operation was great and easy to navigate. Each menu and sub-menu was in an understandable order and category

Louise Coady

Brother MFC-L9570CDW Multifunction Printer

The printer was convenient, produced clear and vibrant images and was very easy to use

Edwina Hargreaves

WD My Cloud Home

I would recommend this device for families and small businesses who want one safe place to store all their important digital content and a way to easily share it with friends, family, business partners, or customers.

Walid Mikhael

Brother QL-820NWB Professional Label Printer

It’s easy to set up, it’s compact and quiet when printing and to top if off, the print quality is excellent. This is hands down the best printer I’ve used for printing labels.

Featured Content

Product Launch Showcase

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?