Both Blu-Ray and HD-DVD discs enable HDTV reproduction because of their massive storage capacities. Using dual-layer techniques, HD-DVD can store as much as 30 gigabytes of data while a Blu-Ray disc can pack in a whopping 50 gigabytes. In the lab, techies already are working on several-layered discs that could allow more than 100 gigabytes of storage on one disc.



Link: Ecoustics