No subject

the hardware rearranges the bits so that there are never more than three
ones or zeros in a row, otherwise the head loses track of where it is.

So it's entirely possible the first two patterns you have are actually
almost the same on a hardware level. What you suggest is probably sufficient
for your average floppy, but not really enough for a modern hard drive.
-- 
Martijn van Oosterhout <kleptog at svana.org>
http://svana.org/kleptog/
> Magnetism, electricity and motion are like a three-for-two special offer:
> if you have two of them, the third one comes free.