1. How does the permanent data removal method classify as software methods and hardware methods?

Generally speaking there are software methods and hardware methods in the permanent data removal process.

1. For reusability of the hard disk, generally a software method uses the DoD (U.S. Department of Defense standard) 3pass or 7pass method.
   {It's a method that overwrites on top of all the sectors of a hard disk, making it unrecoverable}
2. Data BlackHole is permanent data removal software that uses this software method.
3. The hardware methods are Degausser, Crushing, and Dissolution.
- Degausser: A method that uses a powerful magnetic field to erase the hard disk platter so that the magnetic component becomes unrecoverable.
- Crushing: A method that crushes the hard disk platters, making it substantially impossible to recover
- Dissolution: This method due to environmental and safety issues needs to follow exact methodology.
It basically puts the hard disk into the furnace and converts it into raw material.