The EVD disc (Enhanced Versatile Disc) belongs to the Super DVDs, which are characterized by a high storage capacity. The other products are the HD DVD, the Blu-Ray disc, the Ultra Density Optical( UDO) and the Professional Disc for Data( PDD). Unlike the aforementioned products, the EVD disc uses a red light laser rather than a blue laser.
It is a Chinese development of a non-rewritable Super DVD, whose resolution is said to be five times that of a DVD. Since the EVD disc only has a slightly higher storage capacity than a DVD, 12 GB are specified for the two- layer version, it must be assumed that an incredible amount of compression is used to achieve five times the resolution. The Enhanced AudioCodec( EAC) is used for audio compression.