Another type, DVD9, is a single-sided dual layer disc that holds up to 8. DVD5 and DVD9 are used for both commercial discs produced by movie studios and recordable discs for home use. Dual layer media to some extent resembles two single-layered DVDs squished together. A dual layer DVD contain two layers of data on the same side of the disc and separated by a semi-reflective metal layer. To write data to the second layer, a dual layer DVD writer must have a laser capable of shifting its focus past this semi-reflective metal.
One benefit of the additional space is the ability to increase the bit rate of the video when authoring to get higher quality on the finished disc. Typical DVD authoring software applications use variable bit rate encoding to maximize utilization of the DVD disc space. By forcing the application to always encode at the highest bit rate supported, more space will be used on the disc, however the quality difference is noticeable and worth it.
Double Layer DVD recording makes it possible for a consumer to create longer home movies and even consolidated many home movie projects onto a single disc. You can pack up to 12 CDs or 5, floppy disks? Talk about a cool place to store all that stuff cluttering up your hard drive! Those businesses that have already embraced DVD for the distribution of training video on DVD know that more space is often needed to deploy all of the material.
Just like with the example provided for consumer applications, higher bit rate encoding of the video translates into better quality training video for the viewer. Independent filmmakers and studios alike will appreciate the ability to author a Double Layer DVD video disc and try it out without resorting to expensive and time consuming replication.
This group of users can now fine tune their works on cost effective Double Layer DVD recordable discs before creating the master for replication. Certainly business users will appreciate the increased storage capacity of a Double Layer DVD recordable disc when distributing a large amount of data on a single disc is needed, and even for desktop system backup and single server backup with time and cost savings over traditional tape technologies. IT managers can even create their system images for configuring client PCs on a single disc for rapid deployment of new computers on corporate networks.
Because double layer recordable discs are basically one contiguous stream of block addresses, it? DVD Video authoring software has to manage the break point of where the video will be split between layers.
Managing this break point is difficult but straightforward once all the video for a project has been imported into the authoring application where it is separated and allocated for a video DVD. Dual-layer DVDs use both, with the reverse spiral typically on the second layer. Plus- or minus-RW refers to the ability to erase and re-record data, although these discs are normally not as durable long-term and not recommended for critical data archiving.
Single and dual-layer DVDs have another iteration, dual-sided, dual-layer. Designated DVD, these discs house nearly 16GB of data, good for backing up entire smaller hard drives or placing a movie on one side and special features on another.
DVD is another version rarely encountered today, which is dual-sided but having one layer on one side and two layers on the other. DVD is familiar to those possessing some older DVD releases, consisting of a single layer on two sides. This format was widely used to house a widescreen and full-screen movie or special features, each on its own side. David Lipscomb is a professional writer and public relations practitioner.
Lipscomb brings more than a decade of experience in the consumer electronics and advertising industries.
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