Clearing out files permanently on external hard drives
If your company uses external computer hard drives such as those made by Western Digital and those drives are passed around from department to department, you may want to investigate use of a quality drive wipe program. When you delete a file that in no way removes the underlying data contained in that file. All simple file deletion does is to mark the space the file is contained in as now available for more information.
Under normal use, those file sectors may go years before new information overwrites the old data. And even that circumstance can be undone using a simple data recovery program. If you have any type of hard disk or solid state digital storage drive that gets moved from point to point in your organization, the only way to effectively maintain security is to use a disk wipe program on that digital storage media before passing it along.