Double sided DVDRs

[icemanatvcd]

I think they are can by the best media to copy DVD-9. It is still on one disc! Does anybody have tried those discs. Are there any problems with them? Where do you buy the cheapest double sided DVDRs? I have noticed this type of media by Pioneer is very expensive.

Thanks.

[Bulten]

Why do you think it's the best? OK, you only have one disc, and it maybe will be easier not to loose one of the otherwise two discs.
You cannot label the disc though, and you cannot writhe the contents of the disc on it. It will also be more difficult to handle.
On top of that double sided discs are more expensive than 2 single sided ones.
There are also DVD cases that alows you to put two discs in them.
If you have them in the same case, maybe swapping discs won't be much harder than swapping sides.
And finally, there still may be reasons to use double sided DVD-R's, and since you seem to be sure this is the best way, I am really interested in hearing why

[Bob W]

There are center hole labels now and software to print to them so it's possible to label a double sided DVD. I however find it just as easy to change to a second disc as it is to turn a double sided disc over.

[kevlar69]

How about Dual layer DVDR's!. Does anyone know if dual layer writers will ever be available or are they made by sticking 2 layers together?

Kevlar

[garryheather]

DVD-9 DVD-R's are unlikely to be with us in the forseeable future - creating a media and a mechanism where you can burn one layer through another without destroying that first one in the process at such a narrow difference of focal length is not an easy task.

Plus the resulting burn has to be reliable and compatible (the reflectivity of two organic dyes is not going to be even close to the silicon alloy usually used in pressed discs), and bit management is an issue too - the second layer by design has to have less data on it than the first, and the complexity of an authoring program on its own that can take this into account and create a complaint disc means £££ / $$$.

Don't forget the glue holding the two layers together can't be affected by the burn process either - the science between the glues used in DVD's is a nightmare and covered by several patents as it is...

[kevlar69]

Well that's telling me then!

Seriously, thanks for the info, I always wondered why dual layer discs/writers weren't available, and am fed up of explaining to people why most of my DVD backaups have the movie only, and why longer movies are on 2 discs. Oh well, dream on I suppose!

Kevlar

[garryheather]

Pleased to be of assistance !

Funny how the ba*!ard flipper seems to be making a comeback all of a sudden, though.

I guess what goes around, comes around. Then, in some cases, gets ejected and turned over...

[rustic]

DVD-9 DVD-R's are unlikely to be with us in the forseeable future - creating a media and a mechanism where you can burn one layer through another without destroying that first one in the process at such a narrow difference of focal length is not an easy task.

I wonder if they could make discs where you would flip the disc over to burn the second layer through the "top" of the disc, readable from the bottom. Dunno. Just a thought.

[garryheather]

... interesting idea, but I suspect the same problem of one layer being burnt away interfering with the other would still be an issue. Unfortunately they couldn't, for example, laminate between the two, because this would inhibit the pass of the reading layer through the disc as well as the writing layer at the time of authoring. Novel idea, though - who knows - in a few years time that might be the way to go.

The other thing is the pregroove on the disc would have to be reversed on one side and the recorder would have to spin the disc the other way in order to record on this "second" layer. This in itself shouldn't be an issue, but I wonder how many discs would get returned as faulty because someone got their A and B sides mixed up ! (As I am sure everyone is aware, the second, inner layer of a DVD is effectively recorded backwards, so the direction of the disc does not have to change mid playback. All that happens is that the laser focuses beyond the outer layer onto the inner layer, and then plays from the outside in on this "reversed spiral" instead of from the inside out).