I’m selling my laptop and I need to format my laptop so nothing of mine is left on it. How can I do it?
Please see a reccent question, "How can I completely erase all data from a hard drive?".
Hello, best thing is to use the software somebody else mentioned before. Make sure to back your stuff up before doing this.
Darik's Boot and Nuke
Download ISO image and burn it to a CD. Once CD is burned, start computer from CD/DVD drive to run the software. It can take some time to finish specially if it is a hard drive with big storage. Once disk is low level formatted, you can install the operating system
you can delete the files from the hard drive then if you have windows cd boot on it and choose format.
You want to use DBAN (Darik's Boot and Nuke) to securely erase everything on your hard drive. http://www.dban.org/
please check out the solutions to this question:
How can I clean a laptop before donating it?
As well as this article:
5 Things You Must Check Before Disposing of Old Computers