viewtopic.php?f=5&t=3978Specifically the shot below.
Just like cleaning a cd. From the centre to the edge in straight lines.
Add a few oval passes for good measure.
It’s not perfect (maybe 95+%) But in my history with recovery it’s damn close to being so.
Only two 99.9% sure methods work better. An expensive electric magneto-static degausser (a floppy disk eraser will not work on a modern hard disk other than ruining the heads and causing a head crash). And melting the platters on site.
EMSD depends on the “rings” of the tracks to some degree so it’s not 100% perfect. (Yep I have no idea how to describe it, lol).
And melting; look long enough and someone somewhere will have a tale of pulling a few bits off a melted block. Never say never. Etc
As far as my slightly paranoid viewpoint goes, shooting (or otherwise punching) a disk only says “I’m valuable”.
All you need for non-precision recovery is a micro grinder (Dremel), and a matching hard drive. And free open source recovery software
Buff out the bullet hole. Blast it with compressed air. Carefully swap the platters, and run an imaging with -i or /I activated.
Basically my way of saying (as elsewhere) you went through the trouble to get to the point of taking it apart for the platters, so mag them up.