How to really erase an Hard Drive

Since does not exist a REALLY secure Hard Disk erase procedure, the only way to clean every private data from a storage device is to use a powerful tool. Today we expermented the secure data cleaning on a 2.5″ HD with an hammer. Yes, you have understood, an HAMMER!!! What’s more powerful than an hammer?!

This is the result of our experiment:

Any further feedback is really appreciated!