He does a good job explaining what Spinrite actually does.
I've read couple of blurbs someplace poo-pooing Spinrite, and all I can say is that in spite of their negative opinion - back when Spinrite was fresh, it saved my bacon a couple of times.
And, the guy has the creds.
Comments
Also: it will not fix controller/interface or other hardware going south (esp bad cables). It will not fix memory issues which may make the HD system seem flaky.
It will not fix malware.
But it does what it does extremely well.