Print 10 comment(s) - last by NainoKami.. on Apr 16 at 1:06 PM

If dual-layer media makes your mouth water, get some towels ready for 8 layers of Blu-ray goodness

Last week TDK Corporation announced shipments of its first generation of Blu-ray media in both writable and re-writable flavors and also hinted at dual-layer 50GB versions coming later this year.  Recently, TDK prototyped a 4-layer 100GB version of its Blu-ray media which is said to have maximum transfer rates of 216Mbps (6x speed) which will be three times faster than the first generation discs.

After digging through TDK's marketing information on their website we found plans to bring to the market not only 4-layer 100GB media, but also media with 8 layers at 25GB/layer totalling 200GB of Blu-ray capacity. TDK's marketing department has put together a simple picture of how the company fits 4 layers on a disc to bring the capacity to 100GB.

The base of the disc is the plastic substrate which is followed by a reflective layer and a dielectric layer. The media is then topped off with the dielectric and reflective layers and a cover layer, in that order. Between the first and last 3 standard layers comes the first recording layer of the disc labeled "L0 recording layer." There are a total of 4 layers to the right and each layer. Layers L0-L3 are separated by a spacer layer to help the laser focus on the correct layer for reading and writing.

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By DarthPierce on 4/12/2006 7:11:01 PM , Rating: 2
how does adding more layers make it faster? is it reading multiple layers at a time? which should be difficult since it requires different laser wavelengths to distinguish the layers.... which would mean multiple lasers at the same time.... which might explain why it says 2-6x.... so if you have a player with only 1 laser, you still only get 2x.... you have to have a different machine to get the performance improvement of added layers....

nice upgrade path.....

RE: speed
By ktlewis02 on 4/12/2006 7:28:49 PM , Rating: 2
Blue lasers can do things that red lasers can't ;)

RE: speed
By NainoKami on 4/16/2006 1:06:00 PM , Rating: 2
I don't think they mean more layers = faster, but rather that they plan on increasing the recording and playback speeds as they progress... That's why it's a roadmap and not a specification. :)

Will this mean a new player is needed?
By AlexWade on 4/12/2006 8:03:03 PM , Rating: 2
Think how you would feel if you dropped a load of cash for a BR disc and found out that new discs are not compatible with your player because they are 4 and 8 layers deep.

Yet another reason why you should wait until the dust settles.

RE: Will this mean a new player is needed?
By AaronAxvig on 4/13/2006 12:08:26 AM , Rating: 2
Imagine how much a scratch is going to mess with these babies!

With regards to your compatibiliy point, it is likely that the spec for Blu-ray will include the definition of 8 layers, so all players would have the functionality.

By sircuit on 4/13/2006 11:17:27 AM , Rating: 2
Imagine how much a scratch is going to mess with these babies!

Thats why they developed DURABIS2. Even steel wool or permanent markers can't destroy one of these things.

By Egglick on 4/12/2006 9:34:33 PM , Rating: 2
8 layers huh? What will that cost, $100 a disc?? Current blu-ray media is slated to cost $20 for recordable, and $25 for rewritable. That's for single layer.

RE: Yay
By MDE on 4/12/2006 11:04:40 PM , Rating: 2
How much did recordable CDs and DVDs cost when they first hit the market? Give it time, the prices will settle.

RE: Yay
By hoppa on 4/12/2006 11:11:34 PM , Rating: 2
I'm sure writable CDs once cost that much, too.

By Danthemanz007 on 4/13/2006 2:20:26 AM , Rating: 2
Yeah but look at DL-DVD+R, they are STILL so over priced and look like they will never come down...
I so hope that doesnt happen this time, but we all know it will...

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