Overwriting, Saving, Using Stream. Are they really different?

Question

I want to make a file unusable. Does it really make sense if i overwrite it? Is there a difference between overwriting, Using stream , Saving or using text append? Note: I want to delete the file afterwards and avoid recovery.

Answer 1

Appending probably won't help. If you open the file for reading and writing, point to the beginning, and start writing, that probably has the best chance of working (from a high-level language like C#).

You may have to get even lower-level to really do this, otherwise you risk the OS using a different portion of the disk for your new data, defeating the purpose. But I suspect the above should work.