A 3 inch memory storage that holds 43 quintillion bits?

"Okay Ive been used to normal programming for too long but it looks like number of possible configurations isnt number of possible bits"

that line holds the answer to how to use it. you need to look at it another way as how you have been thought to look at things. instead of looking at it like a binary code where all are different numbers in straight lines you instead need to look at it in a more abstract complex paralel way, or let's just call it a more arcane way since that also gives a better vibe for it right now(which can actually help you understand it).
see it like a singular seed that holds all data, a combination of some form of multidimensional compression, you need to store many big things in one amount of date, just like how people like to use quantumcomputers, by computing things that normally are seen as many complex calculations into basically one thing. I actually once designed a computer partly on that principle(to use it properly), not on the quantumcomputer I only realized that later, but on the principle of it acting more like a real universe where all holds many more values and such, was just meant to be a super simple and cheap computer for hobbyists to design with, turned out to be much more complex to understand as right now I have only found one person capable of properly understanding it, but he is also the most intelligent person I know of. in case I might even convince him to get over here(the federation of pangea) his first name is Frank.

however to get the most detailed and high resolution storage in this in the rubic cube form is more complex, since the rubic cube still is like a digital computer showing fixed faces 1's and 0's. in this case you need to somehow invert logic(this is hard trust me just like making something meant to show reality oscilate, it requires different aproaches) and look to what could be stored in the total outside of the currently shown data instead of in that currently shown data, or actually combine them. so you look at all relations and such, just like how you could write a text to hold many different meanings and hidden messages or even links to locations much bigger than the text.
but while this sounds simple it is super hard to get to that efficiency(on smaller levels it might be doable), but it isn't optimal for exact digital storage and such, but instead is better for fictive, or general storage where it is stored more like a general feeling, (this might make it good for AI since many AI work kind of like that, some kind of AI encryption and decryption might also be needed since it would need to adapt constantly, the other use would be for storing essence of reality, or whatever reality it is meant to simulate. but in most cases it would need some kind of self adapting algorythm to properly use it making it very hard to do right.
however if you don't care about everything always being exactly the same that makes it a lot more doable, for example in images and video, video games and such might eventually be able to use something like that, dream like media would work well on such things as well, and even texts could work if you mostly just care about what they mean to say instead of exactly how everything it said. with better development it might be more exact or when less total data is stored.
so it is a very interesting concept but it is also very complex and hard making it mostly fictive in this case unless someone skilled enough actually decides to to fully dive in or get's lucky.