I'm aware of three-dimensional storage hardware, but only at archival speeds. https://en.m.wikipedia.org/wiki/5D_optical_data_storage https://en.m.wikipedia.org

I'm aware of three-dimensional storage hardware, but only at archival speeds. https://en.m.wikipedia.org/wiki/5D_optical_data_storage https://en.m.wikipedia.org/wiki/5D_optical_data_storage (It's so-called five dimensional because you have polarization angle and color in addition to physical position)