Outrageous Calculations

Having discovered that by 2060 we'll be able to simulate the entire visible Universe at solar mass resolution (if Moore's Law holds), I started wondering:

1) How much storage would it need? Assuming each particle had 8 variables at 8 bytes each, Craig, John Helly and I reckoned 45 zettabytes. (4.5x10**22 bytes).
2) If you used a stack of 300Gb hard disks, how big would it have to be? Well, if they're an inch thick then it'd reach to the Moon and back 5 times.

John also thought that if it were held on Commodore 64 tapes, the cardboard box required to store them under your bed would be 24km on a side. I hope therefore that USB keyrings continue to foster a miniturisation in data storage technology.