This badly-named button actually allows you to split the UFD into a pseudo-optical drive and a flash memory area by moving the slider. Set a path to an ISO file (not a folder) in the ISO File Path box (you can browse using the folder icon). Click on the Make button to reformat the entire UFD into two disks, one for mass storage and one for the CDROM.
You can use a DVD ISO or CDROM ISO - for instance a Windows 8 Installation ISO will work. If there is an autorun.inf file in the root, then XP will autorun when you insert the USB pen into a USB port (this is suppressed on Vista/Win7/8).
Windows Explorer will show two devices, a removable mass storage device (e.g. K:) and a CDROM device (e.g. L:). Note that if you previously had a 'public disk' and a 'secure disk' - these will both be destroyed when you format the UFD with 'Autoruns'. If you want a CDROM+public disk+secure disk, then you must first use the AutoRun button and then use the Partitions button.
IMPORTANT: Before you click the Make button, you must first set a CDROM Size that is larger than the size of the ISO file - after you click on Make, the CDROM disk size will be automatically reduced to the smallest possible size, dependant upon the size of the ISO that you picked.
You can then boot from this CDROM disk as if it was a USB CD/DVD device (e.g. Windows 8 installation DVD). The Bios Boot Selection screen will list two devices (usually both have the same name - e.g. "USB: Lexar JD FireFly"). You will have to guess which one is the CD device! This may also be useful for testing out any ISO files you have, without needing to actually burn a CD/DVD.
Make - note that this may produce an error because there is no ISO file specified - the error can be ignored. All data on the entire UFD will be destroyed when you do this.
To remove the CDROM disk area and return the UFD to be a normal mass storage device, move the slider to the extreme left and do not set an ISO File Path and then click
Kill_SMI_UFDisk.cmd script to quit the utility!
You may need to use the