Nothing wrong with it, and it absolutely will stop any kind of casual or software recovery. However, physically destroying the disk is the only way to be sure.

Nothing wrong with it, and it absolutely will stop any kind of casual or software recovery. However, physically destroying the disk is the only way to be sure. And amusingly, it's often faster to physically destroy the disk than it is to run shred on it at today's capacity to write speed ratios. Bonus, not only does physical destruction cover non-working sectors it works on entirely non-functioning disks.