I am aware that to delete something completely we will have to use a program that over-writes the deleted file such that it is unrecoverable.
Is there anyway to tell that this has happened? Or is the resultant state so random that no one can tell that it has just been "cleaned" ?
Ok so we have a 100GB C:\drive and all of the data is "cleaned". After "cleaning", if someone try to do a reversal and couldn't, he will suspect that it is "cleaned" before. So what I do is to copy "random files" and delete them such that if he do a reversal, he would get the "random files". Now the question is, if I simply have 50GB of "random files", will the remaning 50 GB show evidences of "cleaning" ? Do I need to fill all 100GB will "random files" (and delete them) to erase ALL traces of "cleaning" ?