Consider a scenario in which you want to update its hard drive to a new hard drive. You transfer all important data such as documents, emails, invoices, tax returns, photos, details of bank accounts and other various data. Then format the hard drive by Windows utility and sell it. After a few weeks or so, you will find some pictures of yours on the Internet in some fun (but of poor quality) e-mail forward. You have no idea how her photographs got there.

Cause:
The cause of this situation is that although you have formatted the hard drive, the other person may have recovered the data using data recovery tools. In fact, the data can still be retrieved from a storage medium, even if it is formatted, if no new data is saved in it. So, to ensure that storage devices are not misused by those people, you must use a third-party file eraser software to clean hard drives, pen drives, etc eraser tools are able to wipe the hard drive so it is impossible to restore data using any data recovery tool.