Securely overwrite deleted files
Deleted files can be easily restored by data recovery programs unless you overwrite those sectors with new files or large size files, simple copy and paste on files will do the overwrite job, but not completely. Securely overwrite deleted files requires professional data sanitization software to do the overwrite operation sector by sector with meaningless random numbers.
As we cannot see the deleted files on the hard drive, we just know which drive the files were in and that space now becomes free space for newer files, then how to overwrite deleted files traces? All we have to do is to Erase Free Space and by doing this we're overwriting deleted files and free space on the drive.
ByebyeData Eraser is the tool we're going to use for overwriting deleted files, within which there're 14 overwrite methods available and 4 main types of overwrite plans: simple overwrite, single pass overwriting; advanced overwrite: 2-3 passes overwriting; complex overwrite: 6-7 passes overwriting, and very complex overwrite: the famous Perter Gutmann's 35 passes overwriting. We'll take the single pass overwrite method, the default setting, in this guide. Here're the differences between all the standards.
Securely overwrite deleted files with the following steps:
Step 1: Download ByebyeData Eraser, install it and Run it as administrator, then click Yes to the user account control dialog to open it.
Step 2: Check the left side bar, where we listed all the function, and click Free space to erase.
Step 3: In the extended window, all the drives are listed like Windows File explorer, select the drives your deleted files were in and take a look at the security column, like we mentioned before, the zero filling method is the default one pass overwrite plan.
Step 4: Click Erase Now and Eraser will ask you again if you're sure to erase free space on the selected drives, and then click Yes to it.
In this way, all the deleted files are permanently erased, no traces left for the recovery software. Next time, you can use ByebyeData Eraser to directly erase files and folders completely, you can add individual files and folders from different drives to the erase list and also you'll get the erasure report after Eraser finished erasing.