Also, another problem there might be with the implemention of READ and WRITE. So if the division would return a float (say 33.3 recurring), it obviously needs to be converted to an integer as the system time is fully based around integers. Now I believe the most logical thing to do would be to use the ceiling of it (so 34), as at 33 the read/write obviously hasn't finished. However, I believe the sample just performs integer division (which in itself is fine, as it can be done using integer division, but you would need to check whether it divided perfectly, and if not, add 1 to it).