i think liquid nitrogen might actually strip the aluminum layer and the top coating off the disk, from the dissimilar contraction of the materials. or it could fracture the plastic into very small pieces.
i've heard of cryogenically de-stressing rifle barrels to improve accuracy, and that does work, but that's a large piece of steel that often does have uneven stresses in it that make it flex unevenly with changing temperature, changing the point of aim. in that application cryogenic treatment makes sense, but treating cables to change their conductivity characteristics does not. there's a myth that metals in wire and connectors is "crystalline", and therefore wires act like "billions of tiny crystal rectifiers". not so... metals that are in crystalline form are usually very brittle, which when it exists in wire is a symptom of metal fatigue. copper and other metals in wire are ductile and flexible, both desirable qualities in wire. brittle metals like tungsten are not used in wire (except in incandescent bulbs), but even so, do not exhibit anomalies in their conductivity or act like semiconductors. conductors exhibiting such properties would generate large amounts of shot noise.
i've heard of cryogenically de-stressing rifle barrels to improve accuracy, and that does work, but that's a large piece of steel that often does have uneven stresses in it that make it flex unevenly with changing temperature, changing the point of aim. in that application cryogenic treatment makes sense, but treating cables to change their conductivity characteristics does not. there's a myth that metals in wire and connectors is "crystalline", and therefore wires act like "billions of tiny crystal rectifiers". not so... metals that are in crystalline form are usually very brittle, which when it exists in wire is a symptom of metal fatigue. copper and other metals in wire are ductile and flexible, both desirable qualities in wire. brittle metals like tungsten are not used in wire (except in incandescent bulbs), but even so, do not exhibit anomalies in their conductivity or act like semiconductors. conductors exhibiting such properties would generate large amounts of shot noise.