Wednesday, November 26, 2014
Search
  
Submit your own News for
inclusion in our Site.
Click here...
Breaking News
HP Reports Fiscal 2014 Full-Year and Fourth Quarter Results
Hitachi Wearable Device Monitors Brain Functions
Hitachi Technology Stores Digital Data In 100 Recording Layers, Data Can be Stored For 300 million Years
Sony To Provide Refunds To Users Over Misleading Ads For PlayStation Vita
Blu-ray Movie Discs Used As Templates For Improving Solar Cell Performance
PC Outlook Remains Cautious
Trade Your iPhone for BlackBerry Passport And Get $550
GreatFire.org Unblocks BBC Chinese
Active Discussions
Hi All!
cdrw trouble
CDR for car Sat Nav
DVD/DL for Optiarc 7191S at 8X
Copied dvd's say blank in computer only
Made video, won't play back easily
New Features In Firefox 33
updated tests for dvd and cd burners
 Home > News > Optical Storage > Hitachi...
Last 7 Days News : SU MO TU WE TH FR SA All News

Thursday, January 11, 2007
Hitachi Demos Four-Layer Blu-Ray Disc Playback


Hitachi showcased playback of a four-layer Blu-Ray disc featuring a capacity of 25GB per layer. The company said that the drive used for reading was a standard Blu-Ray drive, at its booth at the 2007 International CES.

There have been other academic reports of creating fourlayer (100GB) or even six layer (200GB) disc media by TDK. Some companies have also showcased playback of multi-layer BD media using test players embedded with a special optical head. But in the current demonstation, Hitachi used a 'standard drive'.

"This is the first demonstration of quadruple disc readout using a player based on an optical head generally used in current BD drives on the market," said Hitachi representatives.



Hitachi used an optical disc drive based on the "GBW-H10N" supporting 4x speed BD recording, which Hitachi-LG Data Storage, Inc. announced in July 2006. However, the company made some alterations to the firmware and the optical system inside the head, to make the player compatible with four-layer BD playback. Frontend signal processing (Renesas) and other circuits are the same as those used in the "GBW-H10N."

Of course, the demonstration did not include playback of video. Hitachi set up a reference system that included a PC, the BD drive connected to an oscilator, tuned to display the HF reading signal and especially the data patterns of the disc, which indicate the BD recording marks. According to a report on the Japanese Tech-On website, the first layer (L0) of the 100GB disc included a series of 3T patterns followed by 4T patterns marked on a layer one (L1) above it, 5T patterns on L2 and 6T patterns on L3. When the player picked up signals from each layer on this disc, it displays the signals' waveforms using the oscilloscope. The frequencies changed depending on the layer being read, so demonstration observers could recognize the readout of each layer. However, the drive was not set to pick up the 2T patterns, which are the smallest found on data Blu-Ray discs (3T to 11T for the data features on DVD).

Hitachi said, that developing this technology required a drive capable of detecting which layer to read. The company has not specified how the pickup lens actually detects the readout layer, but reportedly explored a wide variety of methods including a very basic way, in which the pickup lens finds a targeted layer by scanning each layer in order of shorter distance from the optical head.

Quadruple BD capacity could be used for storing Digital Cinema Picture Quality content in the future. For example, a 100GB disc could hold 3.5h hours of 64Mbps video (resolution 4K-2K).


Previous
Next
PSP Plays mp4-AVC videos at 480x272        All News        DIRECTV and Intel Bring Connectivity to TV, PC
DaTABANK DriveCubes Set Expanded to Stamper Testing     Optical Storage News      Nero Digital Audioħ Codec Wins Blind Listening Test at 48 kbps

Get RSS feed Easy Print E-Mail this Message

Related News
Blu-ray Movie Discs Used As Templates For Improving Solar Cell Performance
Pioneer Introduces New High-end Blu-ray Players At CEDIA
Blu-ray Discs For 4K Content And 4K Players Coming Next Year
New BD-DSD Blu-ray Disc Standard Allows Storing 200GB Of Data Per Disc
Optical Disc Sales Down
DVD And Blu-ray Discs Remain Popular in Britain
Blu-ray Disc Format Moving From Consumers To Professionals
Pioneer BDP-170 Blu-ray Disc Player Comes With Wi-Fi, Miracast And Youtube Connectivity
Sony And Panasonic Create New "Archival Disc" 300GB Optical Disc Standard
DVD And Blu-ray Discs Remain Preferred Sources of Video Content
TOSHIBA 2014 Symbio Streaming And Disc Players Coming in Q1
Samsung Says 4K Content Will Be Distributed In 125GB Blu-ray Disks

Most Popular News
 
Home | News | All News | Reviews | Articles | Guides | Download | Expert Area | Forum | Site Info
Site best viewed at 1024x768+ - CDRINFO.COM 1998-2014 - All rights reserved -
Privacy policy - Contact Us .