You've heard of the HD-DVD standard with 30GB and Blu-Ray and with 50GB of storage. Some people, apparently, think that's not going to be enough. Information has already surfaced regarding the Mempile TeraDisc with a capacity of 1 TB (Terabyte). It looks as though the first wave of discs should range from 500-600GB (per disc), with the ultimate goal of having 5 TB per disc. For the love of God, that's 5000 GBs, who the hell needs that much?
These new discs are naturally typical DVD size and use an optical technology, which is compatible with the existing DVD infrastructure. The medium should will work with drives that are fully backwards compatible with DVD and HD-DVD, and probably Blu-Ray.