And then when you know even more you come to realize that filesystems can lie to you, the OS can lie to you, and the physical disks can lie to you. If you are

And then when you know even more you come to realize that filesystems can lie to you, the OS can lie to you, and the physical disks can lie to you. If you are depending on anything in that path to actually assure you that it has written the data via any path other than flushing as many caches as you can and reading the data back out then you will eventually be disappointed.