Improperly disposed of optical media and magnetic strip cards (bank cards, driver’s licenses, badges etc.) that contain sensitive and/or personally-identifiable information, have become easy targets for criminals.
Optical media sanitization methods such as grinding, embossing/knurling, and file deletion/erasure are not always 100% effective, especially for Blu-Ray discs, and data can sometimes be recovered through modern forensic techniques.
Disintegration to NSA specifications is the only reliable means of complete physical destruction that renders data on optical media unrecoverable.