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Reminds me of how some manufacturers tried to combine a small SSD with a large HDD the same way in the early 2010s.

Haha, Apple was still selling iMacs equipped with Fusion Drives in 2021. Really cool tech for the time, but should've stayed in the 2010s

I did realise those were still being sold only a few years ago.

The overall concept still existing at filesystem level such as ZFS’ L2ARC, although this is a RAM heavy feature.