Is it possible to shrink a 50DB BD movie to around 10GB HD file?

Hi all, I got a trouble that my old Blu-ray player refuse to work, and I really hasitate to buy a new one. So can I just backup my blu-rays to computer hard disk, so that I can also enjoy them if I want to. Besides, it is better to best preserve image quality, since i do not need shabby picture that make me frustrated. and, holding the blu-ray extra elements like chapter points, menus are better. And most all of, i want shrink a 50G BD movie to 10G HD file. Thanks.