Paper is an SSD shell, a book is a functional SSD, bookcase is going to be a computer shelf thing. Reed is overgrown weeds, they drop seeds that can be ground up into materials for the SSDs, makes sense right?
Xeno- is a prefix based on the Greek word "Xenos", meaning stranger. In biology, it is often used to designate species-difference, such as xenotransplantation (transplantation between organisms of different species). In science fiction it has been used to refer to extraterrestrial life.