Erasing Your Hard Drive
For those of you who really need your hard disk drives cleansed such that not even laboratory attack would put your erased confidential information at risk, we’re sorry to inform you that viable solutions could be rare, if not, non-existent.
However, if you find it a slim chance that your drive should fall prey to a techie who plays with PSA, HPA, and DCO (see bottom*) all day, a Department of Defense (DoD)-compliant overwrite might still do the trick for you. Just bear in mind that the DoD is no longer responsible for issuing policy or direct guidance on data destruction.
*Inside a Hard Disk Drive...
PSA—Protected Service Areas
HPA—Host Protected Area
DCO—Device Configuration Overlay