Paranoia

Do you take any safety measures for your computer even if they verge on obsessive compulsive?  Even little things that don't matter.

I have several questions that I wish would be answered.

What are secure overwrites?
What are CRC checks on programs?
What is this about BIOS master passwords, let me guess, a way for the government to access any computer just by contacting the motherboard manufacturer? Hmm, is there any way around this master bios password?