We have seen that floating-point arithmetic is neither associative nor distributive. Why do you think this is the case? Why is non-return-to-zero coding avoided as a method for writing data to a...

We have seen that floating-point arithmetic is neither associative nor distributive. Why do you think this is the case? Why is non-return-to-zero coding avoided as a method for writing data to a magnetic disk? Why is Manchester coding not a good choice for writing data to a magnetic disk?