@jk I like the paper on desk analogy.
Hard drive is an encyclopedia, huge and full of info but very slow to find.
Move info from there to your notebook, much faster but can't hold the whole thing.
You do the actual reading and writing on a 3x5 notecard that can barely hold anything but it's unnaturally fast, so you're constantly copying from notebook to card. When you have your writing done you write it back into the encyclopedia from the notebook