The main difference between DVD-5 and DVD-9 is the capacity. • DVD-9 has more space than DVD-5's. DVD ± R DL discs are called DVD9. The DVD9 discs are usually referred to single-side dual-layer discs. DVD9 store accurately 8,540,000,000 bytes and that is 7.95 GB on a computer. A DVD9 disc can store a 240-min DVD movie. • The single-sided double-layer DVD discs can store data up to 8.5GB. Those single-sided single-layer DVD discs can save data up to 4.7GB. They are called DVD5. DVD5 can store accurately 4,700,000,000 bytes and that is 4.37 GB on the computer where 1 Kbyte is 1024 bytes. A DVD5 disc can generally store a 120-min DVD movie.