Just been mailed and yeah theres something else. A ball and liquid! We harp on about a harmonisation of printers and printer ink and processors and compatibilities and one size fits all. Imagine, your trough powder things breaks, all you have to do is buy a generic replacement! CD-ROMS are generic, if one fails you can shove any old make in, they are the same size and one size fits all.
BUT, its not quite that simple, you have to get the make and model and the sales assistant will do the teeth dryer on you (sucks air in whist shaking his head) and tell you 'its going to be expensive as they are hard to get'
Think I might have already said this but...
Computers are a doddle.