You seem to be more interested on proving me wrong, than actually understanding what I am saying: Today SSD's expose a datamodel which makes them look like dis

You seem to be more interested on proving me wrong, than actually understanding what I am saying: Today SSD's expose a datamodel which makes them look like disks. To implement that datamodel, on a storage substrate which have radically different semantics, they have to implement what is essentially a (log-structured-)filesystem. (I happen know this first hand, because I have worked on both file-systems and FALs.) And that is why I say we have two filesystems stacked on each other. Your limited understanding of filesystems does not change reality. Over & out.