Questions About the Playstation 3 and Blu-Ray Connection

[exigentsky]

It has been widely reported that the Playstation 3 will use Blu-ray technology for its fixed storage medium. However, no details have been mentioned on whether games will use single layered or dual layered Blu-ray discs.

If Sony has a Blu-ray reader in the PS 3, will it be able to use only single layered, only dual layered or both kinds of discs? Will the choice of using a dual layered or single layered disc be left up to the game manufacturer?

Basically, will dual layered Blu-ray discs be fully compatible with single layered Blu-ray discs in order for any Blu-ray reader to be able to understand both?

Thank you!