fun fact: one tech my setting has for data storage is referred to as a diamond drive. basically, it's read-only once one is made and you can't write anything to it.
the way it works is you have a diamond, and it's made entirely of carbon-12 and carbon-13. carbon-12 atoms are read as a 0 and carbon-13 atoms are read as a 1.
the information density of these is thus extremely high. you can store an entire library's worth of knowledge on a diamond small enough to lose between your couch cushions. because of this, a lot of them is made up of pointers that just show the readers for them where the actual data is stored, to give them extra mass so that they're harder to lose. typically they're shaped like a rod with a handle added at one end.
