sfill

Securely overwrite the free space and inodes of the partition where the specified directory resides. More information: https://manned.org/sfill.

Overwrite free space and inodes of a disk with 38 writes (slow but secure):

sfill {{/path/to/mounted_disk_directory}}

Overwrite free space and inodes of a disk with 6 writes (fast but less secure) and show status:

sfill -l -v {{/path/to/mounted_disk_directory}}

Overwrite free space and inodes of a disk with 1 write (very fast but insecure) and show status:

sfill -ll -v {{/path/to/mounted_disk_directory}}

Overwrite only free space of a disk:

sfill -I {{/path/to/mounted_disk_directory}}

Overwrite only free inodes of a disk:

sfill -i {{/path/to/mounted_disk_directory}}