I still don't understand the HDD manufacturers why are they not putting anymore a "small" (16-32GB) flash SSD like cache in order to speed up access times and transfer rates? Like WD did a while ago?? That was a briliant ideea and worked perfectly. I still have one of those HDDs in my old laptop and works like a charm.
www.techtarget.com/searchstorage/definition/hybrid-hard-drive

Micron is in a bit of unique position to come up with a unique hybrid storage device that could be both nice in general, but also tiered together with HDD's. The ideal DRAM to storage ratio that is 1000 : 1 there is probably a tiny amount of leeway in either direction of course, in general you won't see much significant performance uplift beyond that though below it you'd could start to see some major drop offs where DRAM cache helps.

Combining that with Optane and NAND in ideal ratio's as well that could then be tiered with or without a HDD would make a lot of sense. You'd probably want a 100: 1 ratio between DRAM and NAND along with a 10 : 1 ratio between NAND and Optane. The idea is you cache the slower with the quicker. Essentially it would be like using symbolic links to different storage types DRAM, Optane, NAND, and HDD and inserting files of different sizes to each that makes the most appropriate sense to leverage performance across each type and minimize the cases where the performance differences of each storage type suffers to the larger degree.

I think a NVME storage cache device from Micron that pairs together 1-2GB DRAM, 100-200GB NAND along with 10-20GB Optane would make a lot of sense to be introduced you'd easily be able to insert it with a 1-2TB HDD and get good results and on it's own it isn't a bad device not to mention it'll drive down the cost of Optane by increasing adoption of it. They could easily scale that to 10GB DRAM 1TB NAND and 200GB Optane as well that could then cache a HDD or perhaps HDD raid of 10TB.

lol is this a joke
it's sad you wasted your time writing this