Wiping or Destroying Your Hard Drive On Purpose
In Washington D.C., there are many organizations that need to wipe or destroy their data. Personal users should also be sure to thoroughly erase a hard drive before donating it. It’s common for scammers to search old computer drives for credit card and bank information.
I earlier noted Darik’s Boot and Nuke which is the best solution for PC users. Mac users should see my post on erasing using Apple’s Disk Utility.
The following video from Systm walks your though using Darik’s Boot and Nuke. And for the truly paranoid, they also show you how to physically destroy a disk.