Yahoo Tech writes, "One of the most tenacious myths in the tech world has involved how to delete the data off your hard drive. First off, it's common knowledge that putting a file in the Recycle Bin and emptying the trash does nothing to actually delete the file, you have to overwrite the space where the file once was with something else. But with what?
Paranoid techies will tell you a drive or file has to be overwritten numerous times with random data in order to "securely" delete it. Some say seven times. I've even heard 13 and a whopping 35 times -- just to be sure, they say. (The real nuts don't mess with software and instead tell you to drill holes in the drive to kill it for good... which is awfully wasteful if you ask me.)"