What is the difference between DVD-DL and DVD-R?

Question by time_waster: What is the difference between DVD-DL and DVD-R?
I know it has more memory space on it, but it’s still a DVD right? I can still play it on my home DVD player? Also, how much are DVD-DL discs usually?

Best answer:

Answer by LexusNoir
DVD-DL stands for Dual Layer, meaning it can hold more than your standard 4.7GB DVD. I believe it can hold upwards of 8.7GB instead. But you need to have a DVD Recorder that suppoorts DL or Dual Layer.

DVD-R just stands for Recordable DVD drive. Meaning you can write once to it. A DVD-RW means you can right to the same DVD more than once.

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One comment to What is the difference between DVD-DL and DVD-R?

  • Top Rated  says:

    A Dual Layer disc differs from its usual DVD counterpart by employing a second physical layer within the disc itself. The drive with Dual Layer capability accesses the second layer by shining the laser through the first semi-transparent layer. The layer change mechanism in some DVD players can show a noticeable pause, as long as two seconds by some accounts. This caused more than a few viewers to worry that their dual layer discs were damaged or defective, with the end result that studios began listing a standard message explaining the dual layer pausing effect on all dual layer disc packaging.

    The larger storage capacity of a DVD-R compared to a CD-R is achieved through smaller pit size and smaller track pitch of the groove spiral which guides the laser beam. Consequently, more pits can be written on the same physical sized disc. In order to write smaller pits onto the recording dye layer a red laser beam with a wavelength of 650 nm (for general use recordable DVD, versus a wavelength of 780 nm for CD-R) is used in conjunction with a higher numerical aperture lens. Because of this shorter wavelength, DVD-R and DVD+R use different dyes from CD-R to properly absorb this wavelength.

    DVD-R discs are composed of two 0.6 mm polycarbonate discs, bonded with an adhesive to each other. One contains the laser guiding groove and is coated with the recording dye and a silver alloy or gold reflector. The other one (for single-sided discs) is an ungrooved “dummy” disc to assure mechanical stability of the sandwich structure, and compatibility with the compact disc standard geometry which requires a total disc thickness of about 1.2 mm. The sandwich structure also helps protect the data containing layer from scratches by a thick “dummy” disk, a problem with CDs, which lack that structure. Double-sided discs have two grooved, recordable disc sides, and require the user to flip the disc to access the other side. Compared to a CD’s 1.2 mm of polycarbonate, a DVD’s laser beam only has to penetrate 0.6 mm of plastic in order to reach the dye recording layer, which allows the lens to focus the beam to a smaller spot size to write smaller pits.

    To learn more, click here:
    http://en.wikipedia.org/wiki/Dvd-r

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