I've always wondered about that. LUK, if the MM stands for minutes and the SS stands for seconds what does the FF stand for? Heck, I'm not even sure the MM and SS stand for minutes and seconds, I'm just guessing.
LUK's answer: FF = frames
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1] Going back to original question, I still don't understand why the source (ISO) shows 355 mins (3106 MB using yr idea/maths) and the target/result on DVD is shown as 340 mins (ish), ie 2966 MB using your maths (NB: I have used the higher factor of your two (74=640/80=700) examples, as they don't actually produce the same answer....). If anything, I would have thought DVD file system would use more space than HDD (NTFS, in case u were wondering)
2] Waddya mean 'probably in old CD-based terms' - aren't you sure? If not, why does your prog display it?
3] I have difficulty believing FF stands for Frames - are you seriously saying there are more than 45 (see my first quoted MM:SS:FF time) frames per second? This is nearly double the frame rate Hollywood uses for film! I suspect it stands for Fractions of a second (ie, hundredths of same), but obviously I could be wrong
NB: This might come across as confrontational (i've just come home from the pub...) but no offence is meant, just 'lively discussion'
Rgds
Lurch