Comment by sgtnoodle

I don't think a faraday cage would help at all to stop any actual particles with mass? It seems like even a steel box would have to be rather thick to make a meaningful dent. Astronauts on the international space station are essentially in a solid metal faraday cage, and they see speckles in their vision each time their orbit passes through weak spots in the Earth's magnetic field.

If you're really worried about cosmic rays, maybe you could try to figure out their predominant direction of travel for your location, then store your SSD in an orientation that minimizes its cross-sectional area. I naively assume they're coming from straight up?