Hard Drive Cleaning

Sup /tech/

So, what do you guys use to remove history from your computer. I am getting a new computer, and I have files on this I want to completely get rid of. I deleted them with recycle bin, but I know that still leaves traces. What kind of software should I use to get rid of deleted stuff for good?

35 passes is stupid.  That might have been advisable when hard drive densities were low, but now they are so high with the 500 GB, that all you have to do is overwrite the whole thing with a bunch of 0's and even the FBI's precious electron microscopes won't be able to do anything.