While both sides claim technical superiority in this format battle, the capabilities of the two different formats are not really all that different. The biggest difference is in the capacity of the discs. Blu-ray boasts up to 25 GB on single-layer discs and 50 GB on double-layer discs, with HD DVD at 15 GB and 30 GB. This could mean that longer movies in full 1080p resolution could be fit on a Blu-ray disc than on an HD DVD, or that Blu-ray could be able to offer more extra features on discs. In practice, we have yet to see this with the titles released so far. Both HD DVD and Blu-ray players are backward compatible with older DVDs, and both can upconvert regular DVDs for viewing on an HDTV.
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