Even the last sentence is complete nonsense > However, you would need to weigh more USB drives than exist on the planet together at once before the difference

Even the last sentence is complete nonsense > However, you would need to weigh more USB drives than exist on the planet together at once before the difference in weight became easily measurable. Scales precisions limits are not absolute, but relative to their measuring range, so if a weight change is too small to measure, the solution is better scales, not more stuff.