Well... if you want to faithfully reproduce a disc (copy it), you need all of the info. If you’re losing some of it by converting to mode1/2048 byte sectors, it’s not a true copy. CDs have mode 1 and mode 2 sectors you see. Chances are, if you’d just specified the destination file name yourself and picked the iso format, the program would have warmed you that your disc didn’t belong in an iso but it might be possible to convert the sectors on the fly so that it could be put in one.