The popular U.S. Department of Defense method will randomly generate nonsense data and completely overwrite your hard drive seven times. The even more secure Gutmann method overwrites the hard drive 35 times. The reason for multiple overwrites is that advanced data recovery methods can sometimes sniff out the patterns behind a single overwrite.

Aug 15, 2016 How to Wipe the Hard Drive of a Windows Computer: Geek If you're selling or giving away a Windows computer, you'll want to wipe the hard drive to remove all of your personal data from it before handing it over to someone new. Simply deleting files or formatting the hard drive isn't enough, as data recovery software may make it possible to recover the data later. 3 Ways to Clear up Unnecessary Files on Your PC - wikiHow Jul 02, 2020 Easy Ways to Clear Space on Your Laptop's Hard Drive Jul 27, 2012

What to do before you sell, give away, or trade in your

Jun 01, 2018 How To Wipe a Computer | Reset Computer Guide 2019 Nov 06, 2019

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Jun 19, 2018 6 tips for cleaning your computer's hard drive - TechRepublic Feb 12, 2018 12 best ways to free up hard drive space on Windows 10 Jul 11, 2020 How to Clean Windows Computer Hard Drive Before Selling? May 13, 2020