i got a new alum iMac about 4 weeks ago. ive been using MTR, but im not sure if im using the best setting for backing up and storing my dvds. then im burning with both toast 9, and ive also done a straight ISO from disk utilities. but, that being said. toast wont touch a memorex DVD+R DL. but i can burn with a single layer. but the dvds are of really bad quaility or decent picture quality and what almost seems to be rapid pausing and unpausing (frame rate isssue?) but ive got enough coasters to start my own coaster shop...help!