What??? My Hard Drive is Toast?

Nine months later, the Spectre died. Really died. The so-called Blue Screen of Death with the error 0xc000000f was all that I could get. I ran all the diagnostics that I could on it, and all tests passed except that the hard drive could not be found. When I tried to run a diagnostic test on the hard drive, I got a message saying that "this media is not relevant to this computer."