I haven't RE'd SpinRite myself, but I remember reading from some others who did and concluded that it was basically very similar to ddrescue's algorithm, but wi

I haven't RE'd SpinRite myself, but I remember reading from some others who did and concluded that it was basically very similar to ddrescue's algorithm, but with some additional use of "read uncorrected" commands and statistical analysis. The latter is implemented by other DR software too: https://www.deepspar.com/blog/Read-Ignoring-ECC.html https://www.deepspar.com/blog/Read-Ignoring-ECC.html