Memorex was your first mistake, also advise you to update your firmware on your Samsung drive to TS03. Update your firmware, use better media, check to see if the Samsung does support bitsetting. That should solve your problem unless you are burning R\W media and your JVC stand alone is not capable of reading rewriteable disks.
CD Freaks Samsung DVD Burner Forum
http://club.cdfreaks.com/forumdisplay.php?f=105