 So you want to create a directory that runs completely in RAM. Well, first thing when you do is create that directory. So sudo makedir and the directory you want to create. And then we will just run sudo mount-o size and give it the size that you want to create this RAM disk as dash t for type. And it's going to be a temp file system, so tempfs, none. And then the name of that directory. And now if we df-h, you can see that we have a directory mounted that is 1 gig in size and 0% of it's being used right there. And anything you put in that directory will actually be written to RAM, not your hard drive. And upon reboot, will be gone and cannot be recovered from your hard drive because it was never written to your hard drive. That's how you mount a directory to RAM.