I like to use dice to think about storage. If a byte is the size of a die (let's say 1cm^3), then a kilobyte is a 10x10x10 cm^3 cube. A megabyte is a 1m^3 crate, a gigabyte is a 10m^3 house, a terabyte is a 100m^3 tall building, a petabyte is a 1km wide borg cube etc.