Reformatting isn't enough to truly delete data from your hard drive, you need to use a disk-wiping utility. Luckily, though, there are many recommended ones that are free.
From the blog [Geeks Are Sexy] comes recommendations for 3 programs you can run that fill your hard drive with random information, no matter the type of computer you have. This is important because even if you reformat your hard drive, there are programs to pull that information off the hard drive.
