linuxworks, I'm not sure if this has anything to do with your username, but Windows does do CRC checks when copying files.
GirgleMirt, the reason cables/burn-in are controversial but pure digital copies are not is because the former are at least plausible while the latter are not. Also, a lot more people are informed about how a digital copy works, so as soon as someone asks or suggests that pure digital copies are degrading their music, they get shot down. This keeps the "placebo" from spreading. Also, SPDIF is not a pure digital transfer as it carries a clock signal as well as the digital sample data.