Previous versions of the format allowed for the storage of up to 30GB, but the latest version can read into a third layer on an HD DVD disc so it can hold up to 45GB of data. The 45GB version of the disc is a read-only version. Toshiba also announced a double-sided, dual-layer, hybrid read-only disc storing up to 30GB on the HD DVD side of the disc and 8.5GB on the standard DVD dual-layer side of the disc.Blu-ray, another next-generation DVD format, support 50GB of data on a dual-layer disc. More info at Toshiba
Toshiba announces 45GB HD DVD

The next-generation DVD format war is still heating up as Toshiba yesterday announced a new 45GB version of its HD DVD disc.