Leader Next Human Sandwich

[Weltall]

Overwriting a file doesn't destroy it completely, since the process of writing to a hard disk is inherently an analog one. Now, overwriting the sectors that the file occupies several times will eventually get enough of it so that it's irrelevant, but the process IS analog, and therefore, there is always a trace.

Think of a cassette tape. Granted, the process is different, and less efficient, but you know at times a part of a tape can be recorded over, yet when that part is replayed, you can still hear a ghost of what was once there.