Originally posted by train_ucl i calculated with my alst movie, 280 frames, 320*240 went out to be ~ 100MB ... so, 1024 is about 3 times larger, so 100 MB * 3 ... and 768 is again about 3 times larger than 240, so 300 MB * 3 = 900 MB ... Hello! That sounds quite logical! So I think I have enough space on my drive? Thanks for all your help, I'll now render it in a single 1024*768 movie Best Regards Markuz