This is travel-related only in that it applies to my laptop that I use for travel. But still some of you may have had this problem. I have just had a defective laptop replaced by the manufacturer and, not surprisingly, they want the old one back. I've deleted all my files but as I'm not sure what will happen to the hard drive, I would like to be confident that they are unrecoverable.

Can anyone recommend some good, preferably inexpensive, file-shredding software?

And is it better to buy it locally from some place like BestBuy or to download it from a website?

Thanks.