BIN+CUE = wasted space?

while i’ve been doing the CD-images, i did one in ISO and second one in BIN+CUE. and you know what i noticed? ISO was the same size as CD [641MB] and BIN+CUE took me 736MB.
Where’s the catch?

the catch is…that not all iso’s are the same size as the CD. Most are larger also.

If there is also audio tracks on a cd then a .bin/.cuewill contain those audio tracks.
An .iso never will.

you’re right. thanks.