Fill Free Disk Space on Mac

Deleting files does not always mean the old data is gone. FillDisk Pro writes temporary data into available disk space, then optionally removes it again when the job is done. Use it on a used volume to overwrite free space, or on an empty drive to write over the drive before you reuse, archive, or hand it over. Fill the available space. Optionally remove the temporary fill files. No complicated disk tools. Just a focused local workflow for filling available disk space. https://medium.com/@chris.ahrweiler/fill-free-disk-space-on-mac-a5b4cc30b007