Naomi is trying to fix a hard drive with SpinRite, but it won't even see the hard drive. Leo says it's likely that the circuit board on the hard drive may have failed or has become damaged. If she can find another similar hard drive and swap out that circuitry, there's a good chance it'll be able to read it.
How about putting it into external USB enclosure? Leo says that often USB will hide a drive if there's a hardware issue.