1. Use Hardwipe to permanently erase data on disk and portable storage media, thus ensuring that discarded, but sensitive, information can never be recovered by someone else.
Hardwipe can not only wipe drives and USB media, but can also sanitize the Windows Recycle Bin, overwrite selected files and folders, and clean unused drive space of unwanted remnant data. Furthermore, you can run Hardwipe as a standard-alone application, or use its convenient "right-click" context menus from within the Windows File Explorer.
Hardwipe is free for individual use. A professional upgrade is also available.
This is a Windows utility.
2. Instead, if you like to create a LIVE CD or USB Live you can download this utility DBAN:
http://www.dban.org/download (inside blog you can find a lot of utility that give you the ability to create USB live from .iso files.
3. Otherwise you can download:
Hiren's BootCD 15.2
http://www.hiren.info/pages/bootcd
Create relative ISO/USB live and search for utility and search for this utility:
- Darik's Boot and Nuke (DBAN) 1.0.7 Completely deletes the contents of any hard disk it can detect.