"The internal DRU-700A and external DRX-700UL drives will offer almost double the storage capacity of current, single-sided discs, the company said. The forthcoming devices will let users record up to 8.5GB of data, which translates to 4 hours of video or more than 2,000 songs. They will have a double-layer data-recording speed of 2.4x initially, and also will feature the ability to record using both the "plus" and "dash" formats at high speeds (up to 8x DVD+/-R)."
Impressive, but for some reason I just don't quite trust Sony's format. A standard for Dual layer format has not yet been reached, so right now the landscape is rather disparate. :?