> It needs a filesystem for the same reason they were invented for computers: to provide an impedance match between the upper layer semantics (a stream of pairs

> It needs a filesystem for the same reason they were invented for computers: to provide an impedance match between the upper layer semantics (a stream of pairs describing a protein) and the lower layer storage (blocks). Using block structured storage is more flexible in terms of being able to insert in the middle of a file, etc etc. As a non-CS person I find this explanation opaque.