DVDs, known as "digital versatile" or "digital video” discs, continue to replace CDs as
the storage medium of choice. They look like CDs but hold much more information typically 4.7 gigabytes of computer data, which is more than six times the capacity of a conventional CD. DVD players and burners are becoming standard equipment with new computers because DVD video has
reached critical mass acceptance and because DVD players and burners are backward compatible with CDs. DVD technology includes multiple formats, not all of which are compatible with each other. The newest format is Blu-ray, which beat Toshiba's HD DVD format in 2008 and currently ships a top double-layer capacity of 50 GB (Fackler, 2008). A growing number of devices can both read and write to Blu-ray discs.