Pyramid has an article about how much information can be stored in a book. You need so be a subscriber to read it. As a spin off they’ve made a calculator to work out how many ox carts it would take to carry around the data stored on computers, CDs and DVDs if it was written out. You don’t need to be a subscriber to use the calculator which you can find at a page cunningly titles:
How Heavy Is Dense Reading? Supplemental: An Oxcart Full of Knowledge
If all the data in electronic form in my flat were turned into illuminated manuscript I’d have about 59,000 ox carts worth!