This model can store 32 bytes with a write function. It comes with a sequential address counter to seek for the right address. the max seek time is ~ 12.4 to 13 seconds assuming 31 cycles * 4ticks / 10ticks .This tech is pretty old and has been done before, but I like it for what it is XD It might be fun for tiny computer projects.
With some hex magic you can cram in more.
Why not cauldrons? That would give you 2 bits per block. Probably slow to write to though.