Will write-once BD-R discs be A LOT BETTER for long time archiving ?

Will write-once BD-R discs from TDK be a lot better
for long time archiving ?



While reading all what is published about the so called «format war» Blu-Ray vs HD-DVD,
among all the arguments about capacity, costs and copy protection for movies
I found far more interesting the following things about the sensitive material that is going to be used for recording in the new formats.
My surprise was that TDK says that they use 2 non-organic layers
for manufacturing their write once BD-R discs.
I don’t know if others companies that have already announced Blu-Ray discs (like Sony for example) are going to use a similar technique for their BD-R discs or not ?




Press release from TDK about manufacturing of their BD-R discs
published on January the 5th 2006:
http://www.tdk.com/tecpress/20060103_bdship_ces.html
Here is the interesting part about how the data are written and protected in the BD-R format:


Fig. 6 Recording process with write-once type BD-R media



1. When the recording laser makes contact, its heat melts the Si and Cu alloy, which become mixed.

2. When the mixture cools, the hardened Si and Cu alloy become a composite, in which the recording mark is formed



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Comparison with HD DVD still using organic dye:
http://www.cdrinfo.com/Sections/New...px?NewsId=16533

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Last edited by Wizzu; 25-03-2006 at 22:28.

I suppose it will be imposible to know this until the discs are ready to be consumer tested. I like the idea of the non-organic dyes though, lets hope it improves things.

We all have high hopes, but at present we're left with conjectures... the industry has a long history of exaggerated claims.

Nevertheless, thanks for the pictures and infos, Franz, very interesting

According to Ricoh, their HD DVD-R and BD-R discs both use inorganic recording materials, also.

http://www.justnow-press.de/showPrAr...&nLanguageID=2