If you’re reading this blog then chances are you have a dead hard drive ... scratch controller. The gist of the build is that you use an optical mouse sensor to track the movement of the platter.

Laptop hard ... the drive is used, data about bad sectors is added. If the drive is badly damaged in the areas that contain this drive information, replacing parts may not be enough to recover ...

Instead of reading the out of phase sine waves produced when a hard drive platter is manually rotated ... drives stepper motors and allows him to scratch and cut to whatever his MC desires.