Look up: DVD-D

1. DVD card
   A `DVD card`, also called `Business Card DVD`, is a DVD with the size and shape of a business card. Much like a traditional DVD, is an optical based media whose primary function is DVD-video playback and data storage. In recent years the DVD card format has been used in the retail market to distribu...
   Found on http://en.wikipedia.org/wiki/DVD_card
   
   
2. DVD Unlimited
   `DVD Unlimited` was an DVD-by-mail service based in Auckland, New Zealand. It was a wholly owned unit of SKY Network Television. It competed directly with Movieshack and Fatso. DVD Unlimited was originally based in Nelson, and was created in late 2003 by Don and Sandy Webster, a couple who ran a tra...
   Found on http://en.wikipedia.org/wiki/DVD_Unlimit
   
   
3. DVD-SVCD
   This is SVCD authored video on a DVDR/W. The DVD standard does not support the SVCD resolution but it may work anyway if the audio has been resampled to 48 khz like the DVD-VCD. Read more here about DVD-SVCD discs.
   Found on http://www.videohelp.com/glossary?D
   
   
4. DVD-VCD
   Basically this is VCD content authored on a DVDR/W. DVD supports the VCD resolution but the audio has to be resampled to 48 khz. Read more here how to make such a disc.
   Found on http://www.videohelp.com/glossary?D