The mechanic who did it told me that the spin-balancing process actually distributes the 1s and 0s evenly across the platter so that the 1s are evenly distributed and so are the 0s. It's not that the number of 1s has to equal the number of 0s, but that you can't have all the 1s on one side of the disk, or that side will get too heavy and tip over.
Do try to keep up with technology, eh?
;->