Hard disk material - of topic Rocket Science

if this was the case, the surfaces just needed to be plated, you can produce a uniform thickness by polishing. Some sort of contraption (a lathe?) would be necessary, but it's not rocket science I don't think. I was between jobs a number of years ago and applied at this place in Long Island that makes some sort of microchips. The silicon wafers needed to be made *uniform*, and they used some sort of polishing operation. I asked what was the tolerance, and the guy said .0001". I figured to myself he probably didn't really know what he was talking about and the tolerance was much tighter. Cast iron surface plates can be made uniform to .000025" (that's right, 25 millionths of an inch), but that's an entirely different operation, and in fact is done - by hand - w/a glorified chisel. Carry on lads. I'm interested in learning more about this meself