Hi! I've read somewhere that people can read through layers and layers of data on a hard disk. So even if you format your hard disks and write over the old clusters, someone can still read what was previously on the disk. I also read somewhere that these people can read to about 30 layers of old data on a disk. I'm sure you guys know what I'm talking about.
How feasable would it be to write a simple program that just fills the HD up with junk data files, then formats the disk, and keeps doing that over and over and over?. I think I could write a program to do this, let it run over-night and in theory it should have been filled and formatted hundreds of times. Does anyone think this would make it impossible for someone to get old data from my HD?
I'm building a new PC, and will definately get rid of my old one. I'd like give it away without taking a hammer to the HD's.
Any thoughts, suggestions? Am I just being silly?