Why would anyone ever need any drive wipe program? In one simple word, security. It is just too simple for anyone to access your computer and remove from your hard drive all of the information. Within seconds the information on your computer’s internal hard drive can be downloaded to a simple USB flash drive. From there, parties you do not want to share your personal information can leisurely sort through your data until they find important financial records such as credit card numbers, your home address, etc.
Consider what happens to your computer when you deem it obsolete and donate it to a worthy organization such as Goodwill or the Salvation Army? You may have deleted all of your files, but the information you stored on that computer is still available to anyone with a simple data recovery program. To counter this risk you need software to permanently delete files. A quality drive wipe program will overwrite the existing file information on your hard drive scrambling it many times over in a random pattern to such a degree of efficiency that it can never be reconstructed.