TDK Develops 1TB Optical Disc

Blu-ray logoTDK showcased an optical disc with a capacity of 1 Tbyte at Ceatec Japan 2010 trade show.The disc is formed by 16 recording layers, each of which has a capacity of 32 GB.

The problem with multilayer optical discs is the difficulty to obtain clear signals from each recording layer in a stable manner due to crosstalk from adjacent layers, transmission loss and spherical aberration.

Each layer should be seperated from the rest using reflective materials, which would not allow optical laser to reach to innermost layers, but also dielectric materials, which would minimize the transmittance loss when the laser has to reach specific layers.

TDK has developed a dielectric material as the reflection film that offers a high light transmittance in order incident light to efficiently reach as far as innermost layer and produce a clear eye pattern (read-out signal).

The result is impressive: While the light transmittance of a single layer is 95.1%, it becomes just 72.6% for the total 16 layers of the disc. The specific material has been already used in the currently available Blu-ray discs, according to TDK.

In addition, data on the disc can be accessed using a laser diode with a a numerical aperture of 0.85, which is also used for the Blu-ray Disc.

TDK 1TB Optical Disc

According to measurements made by TDK, the symbol error rate for reading out data stored on the disc ranges from 1 x 10-5 to 1 x 10-4, which is acceptable and low enough for commercialization of the disc.

However, the disc is thicker than what the specifications for the Blu-ray discs demand (<100μm). The recording layer of the new disc is 260μm, increasing the influence of spherical aberration. This means that althpugh the disc could be read using a BD drive pickup, an improved objective lens and a wide range compensator would be requierd in order to effectively decrease spherical aberration.

TDK has not provided information on how it managed to reduce the interlayer crosstalk. Hovever it is assumed that it stacked two different thickness of layers alternatively.

TDK expects that the new optical disc will be used as a consumer recording medium, a backup medium and a medium for a broadcasting service. However, its commercialization depends on disc makers.

Source: CDRINFO

Tags: Blu-ray

Comments
Add comment

Your name:
Sign in with:
or
Your comment:


Enter code:

E-mail (not required)
E-mail will not be disclosed to the third party


Last news

 
Galaxy Note10 really is built around a 6.7-inch display
 
You may still be able to download your content
 
Facebook, Messenger and Instagram are all going away
 
Minimize apps to a floating, always-on-top bubble
 
Japan Display has been providing LCDs for the iPhone XR, the only LCD model in Apple’s 2018 line-up
 
The 2001 operating system has reached its lowest share level
 
The entire TSMC 5nm design infrastructure is available now from TSMC
 
The smartphone uses a Snapdragon 660 processor running Android 9 Pie
The Samsung Galaxy A5 (2017) Review
The evolution of the successful smartphone, now with a waterproof body and USB Type-C
February 7, 2017 / 2
Samsung Galaxy TabPro S - a tablet with the Windows-keyboard
The first Windows-tablet with the 12-inch display Super AMOLED
June 7, 2016 /
Keyboards for iOS
Ten iOS keyboards review
July 18, 2015 /
Samsung E1200 Mobile Phone Review
A cheap phone with a good screen
March 8, 2015 / 4
Creative Sound Blaster Z sound card review
Good sound for those who are not satisfied with the onboard solution
September 25, 2014 / 2
Samsung Galaxy Gear: Smartwatch at High Price
The first smartwatch from Samsung - almost a smartphone with a small body
December 19, 2013 /
 
 

News Archive

 
 
SuMoTuWeThFrSa
     12
3456789
10111213141516
17181920212223
24252627282930
31      




Poll

Do you use microSD card with your phone?
or leave your own version in comments (16)