(as seen on /.)
A disc that has 10 layers (compared to a maximum of 2 for a CD, and maximum of 4 for a DVD.) What’s even scarier about the disc, which is of the same size as a CD or DVD, is that it can store up to a massive 140 GB! That’s more than 7 times what a DVD can store, and without having to turn the disc! With 140 GB of storage capacity, you could fit over 20 hours of HDTV (MPEG-2 compressed) video, a small library or the contents of your entire CD collection, uncompressed, on a single 120mm disc!

-- Source:

Duracz, Adam. "DVDead."
  12 Feb. 2000: 4 pag. On-line. Internet.
  Availble WWW: http://www.3dhardware.net/features/dvdead/