Sorry to say, you're both wrong. DVDr actually holds 4.381 Gigs (4,704,317,440 bytes). Bytes in a Sector = 2048. Standard DVDR capacity: 2,297,888 sectors. FileSystem Overhead= 858 Sectors. (2048*2,297,888)-(2048*858) Total= 4,704,317,440. 4,704,317,440 bytes=approx. 4.381237 Gigs. I don't recommend using these figures when you're trying to determine CCE bitrates or whatnot. 4,700,000,000 should suffice and will give you a margin of error.