FlashBoot can wipe USB storage device. This operation will erase all files and free space on said device, so any data from it can't be undeleted.
1) Run FlashBoot Free or FlashBoot Pro, click Next
2) Choose "Format as non-bootable" in the Main Menu
3) Choose "Wipe (securely erase all data)" in this menu and click Next
4) Specify target USB storage device and click Next
5) If necessary, change volume label, or leave it as is, and click Next
6) Check summary information and click Format Now
7) Wait for process completion
8) Non-bootable USB storage device is ready to use. Click OK to exit
