I am worried whenever I have to discard a computer. I know that it is hard to remove data completed from hard drives and that skilled hackers can still get data off of it, even if you think you erase all your personal data. My husband tells me that we should get drive scrubbers to clean the data. I used to clean that by using the dos prompt and command for reformatting hard drive that I could remove any personal identifiable data. By my husband said that is not necessarily so. He said the only sure way is to either scrub the hard drive with a scrubbing program or to destroy it.