A DVD player cannot play a BluRay disc. A BluRay player can play both BluRay discs and DVDs.
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Yes, it plays blu-ray and regular dvds.
To play a high definition DVD, you need a high definition DVD player. There are two types available currently. HD DVD, developed by Toshiba is one and BluRay, developed by Sony is the other. They are not compatible, so an HD DVD will not play on a BluRay player and a BluRay disc will not play on an HD DVD player. BluRay looks like it is the winner in the format war between the two companies over the last years so it is likely that Toshiba's format will disappear in the coming months. Note that HD DVD can refer to the Toshiba format but it can also refer to high definition DVDs in general.
The Xbox 360 is not made to play Blu-ray DVDs. It will only play standard DVDs and this is likely the source of your problem.
Some might. When picking out a player, be sure to read the product descriptions
There are no thin DVD players by Sony that can hold ten DVDs. They do make jukeboxes that can hold hundreds, however.
The advantages of owning a Sony Blu-Ray player is the ability to buy Blu-Ray DVDs which have a higher quality of sound and image than HD-DVDs. Although, they can be more costly.
Bluray players are backwards compatible so they will play standard DVDs as well as Bluray discs. Note that although the DVD is being played by a Bluray player, it does not make it HD quality. Some bluray players will up-convert the standard definition image from 480 or 576 lines up to 1080 lines but although the format is HD, the image quality still remains standard definition.
Someone at Sony invented the BluRay concept. It was introduced in 2001. The first Blu Ray players were initially marketed by Sony in two thousand and six.
No and HD DVDs have been discontinued
Sony doesn't support apps from outside world. There is no widget platform supported by Sony.