Girls on a vacation

There is three ways:

• computer says "I don't if this sector of memory would get rewritten". Most of the data restoring software works by ignoring it

• computer will rewrite fill memory sectors with zero. Data is 0s and 1s that have meaning, if everything is 0s, there would be no meaning.

• physical way - do something with hardware to erase data

Also, don't forget about other ethnicities that mostly uses russian and decided to learn kazakh