Dual layer, double layer, double sided - seek clarification

Discussion in 'Amateur Video Production' started by Doc, Mar 15, 2006.

  1. Doc

    Doc Guest

    Seeing another recent thread that mentioned this topic made me think of
    this. Hoping for clarification on this issue.

    Is it correct that a "dual-layer" DVD has 2 layers of recorded media on one
    side, while "double-sided" means you can flip the disc over and record on
    both sides? When playing a dual-layer disc, does the player actually engage
    2 lasers as opposed to 1 laser to read a single-layer disc?

    Going on the premise that the above is correct, are commercial DVD's dual
    layer? Will any standalone DVD player play a dual-layer disc?

    I have an Aopen Chameleon burner that's labeled "Double Layer" - is this the
    same as "dual layer" or is it just another way to say double-sided?

    Do all DVD burners burn double sided discs? If not, why not? Doesn't the
    cutting laser only care about the media that's presented to it?

    Is there such a thing as a disc that's both dual-layered and double-sided?

    I see someone said burning on a dual-layer disc would increase image
    clarity. Is this why the software (Pinnacle Studio 9 in this case) asks if
    you're burning to a 4.7 gig or 8.5 gig disc? The 8.5 gig disc means
    dual-layer and assumes you actually have a dual layer capable burner?

    I assume in the case of "double sided" discs, you would treat it as a 4.7
    gig disc and simply flip it over to burn another project. Yes? No?

    Doc, Mar 15, 2006
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  2. Doc

    PTravel Guest

    No. It usually simply refocuses the laser to pick up the second layer.
    Some are, some aren't. It depends on the length of material, number of
    extras, and desired quality.
    Yup. It's part of the spec.
    It's the same as dual-layer. Dual-layer media is considerably more
    expensive than single-layer, but it's readily available.
    Pretty much, yes. It's just a question of flipping over the disk and
    burning the second side.
    Yes, but I haven't seen recordable double-sided, dual-layer disks. They may
    be around.
    Not exactly. A single-layer DVD has a 4.7 gigabyte capacity. A
    double-layer DVD has an 8.5 gigabyte capacity. Larger capacity means that
    the video does not have to be compressed as much. Less compression means
    better image. HOWEVER, many dual-layer commercial DVDs use the additional
    storage for more extras.
    I don't use Studio, but I'd suspect it's asking so it knows the format in
    which to burn. It is possible that it makes compression decisions based on
    that information. I use a standalone transcoder that lets me determine
    compression rates and final size. When I burn a DVD, my burning software
    automatically detects the type of DVD in the drive.
    Yes. If you're doing a dual-layer disc correctly, you should also set where
    the layer switch takes place -- you don't want it in the middle of a scene
    with motion because most players take a second or so to switch layers. With
    consumer products like Pinnacle, you may have to accept the layer switch
    wherever the software decides it should be.
    You're welcome.
    PTravel, Mar 15, 2006
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  3. Doc

    J. Clarke Guest

    No, it focuses the laser at one of two different depths.
    Most commercial prerecorded DVDs are dual layer. Any standalone DVD player
    should play dual layer commercially pressed DVDs. Whether they will play
    field-recorded dual layer DVDs is another story.
    Very, very few DVDs other than DVD-RAM are double-sided, and no burners that
    I am aware of do anything special for double-sided disks, you just flip the
    disk over. "Double layer" and "dual layer" would be the same thing.
    It doesn't cut, it causes a change in the chemical structure of a layer of
    dye or crystalline material. To record dual layer it has to be able to
    selectively focus on one of the two layers.
    Never heard of one.
    The only manner in which burning on a dual layer disk would increase image
    quality would be by allowing you to use a lower degree of compression.
    There is nothing inherent in the recording methodology itself that would
    cause such a difference.

    The software asks so that it knows what sort of media for which to prepare
    the file structure.
    J. Clarke, Mar 15, 2006
  4. I have several commercial DVD video discs that are double-sided.
    Perhaps Mr. Clarke read the question wrong?

    I don't see why there would be ANY burner that could not handle
    double-sided (assuming it was capable of burning the type of disc,
    i.e. CD or DVD+ or - etc.) As Mr. Clarke said, makes no difference
    whether a disc is single sided or double sided. You just take it out and
    turn it over to play/record the other side.

    You can assume that no burner can handle double-layer
    unless it explicitly says it can.
    No reason they couldn't make them, however. I thought this
    variation was defined and had a name.
    Richard Crowley, Mar 16, 2006
  5. Doc

    J. Clarke Guest

    I was thinking of field recordable media. You are of course correct that
    there are commercially recorded DVDs that are double-sided--I've got a
    couple myself. The trend there though has been to go to multiple disk
    sets, probably cheaper to press two single-sided than one double-sided.
    Sorry, for some reason I read "double sided" as "double layer" in that
    Probably does, but try to find one in a store.
    J. Clarke, Mar 16, 2006
  6. Doc

    Doc Guest

    Just to clarify, yes, I was referring to recordables.
    I understood that you misread.
    Doc, Mar 16, 2006
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