Active KillDisk is a quality security application that destroys data permanently from any
computer that can be started from floppy CD USB. Active KillDisk Professional conforms to US Department of Defense clearing and sanitizing standard DoD 5220.22-M. New Wipe function that wipes out all unused space on existing drives, not touching existing data.
5.1 version supports 17 security standards from various countries such as:
Bruce Schneier's algorithm
Canadian OPS-II
DoD 5220.22 M
Gutmann's algorithm
German VSITR
HMG IS5 Baseline
HMG IS5 Enhanced
Navso P-5329-26 (RL)
Navso P-5329-26 (MFM)
NCSC-TG-025
Russian GOST p50739-95
US Army AR380-19
US Air Force 5020
and some others

You can be sure that once you wipe a disk with Active KillDisk, sensitive information is destroyed forever.