text: can you explain this discrepancy in recording dvds? the easiest way to explain is to give a typical example:  i just recorded a dvd that, according to my nero system, was 4.37gb. when, however, i go to delete the same files from my hard drive, they are less than 2gb in size.   what accounts for this much discrepancy in sizes? i vaguely understand that there would be some discrepancy in sizes between what is burned and what is deleted, but 2 gigs? an mpeg is not what goes onto a dvd. nero takes the mpeg and transcodes it to .vob before burning, so they are two different types of files. mpeg is compressed.