1. 
   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 op http://www.videohelp.com/glossary?D
   
   
2. 
   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 op http://www.videohelp.com/glossary?D
   
   

Tip: double click on a word to show its meaning.