I believe you are familiar with this use of UltraISO, which is similar to the Nero we use, can burn discs. But the most I use is the UltraISO, which can modify the boot disk image file (Nero can not try), you can delete some of the stuff, You can also add some useful tools to it. More important to use this system USB disk boot disk.
About the UltraISO software installed Ann I have omitted ...
After the UltraISO is installed, there is an icon on the desktop.
and installed the UltraISO software, some image files icon into the following look, now we use the "Rain Tree Maple" Start disk to make changes.
When you double-click to open, see figure below
Now click "Action"----"Create a new folder" and rename it "MHDD"
Then enter the MHDD folder, click "Add File" and select the file to be added
The file is now stored in the MHDD folder.
Finally, to save, the processing process can take a minute or so, which depends on the size of the image file.
Image file modified.