The capacity of Blu-ray is 25 GB (single layer)& 50 GB (dual layer). I really don't know what you mean by "is it safe" please be more descriptive. But take a look at this website. It should explain ALL about your Blu-ray thoughts. and Yes Blur-ray is AWESOME! It has SUPERIOR quality in Audio and Video. http://en.wikipedia.org/wiki/Blu-ray_Disc Enjoy