u3-tool (utility for U3 flash drives, including SanDisk and Verbatim)

Tool for controlling USB flash devices that confirm to the U3
specifications. This program can control the following features:

Replacing of CD image
Changing of virtual CD allocated size and completely removing it
Enabling and disabling Security
Unlocking and changing password of secured U3 device
Obtaining various device information

In general all U3 USB flash devices should be supported. A list of devices
that are reported to work with this tool is available in the forum:

http://sourceforge.net/projects/u3-tool/forums/forum/746414/topic/3559573