Thanks. What sparked my curiosity is while I'm writing code even a small mistake in the most simple programs can cost me tens or hundreds of milliseconds wherea

Thanks. What sparked my curiosity is while I'm writing code even a small mistake in the most simple programs can cost me tens or hundreds of milliseconds whereas behind a simple flushing to disk command there is so much happening at so many layers all in sub-millisecond or at most in a couple of seconds.