Justin Yes, I originally wanted to do that. In general, I wanted to make the partitions of the flash drive (I have it at 64 GB). Then, in each section, make "dd" for each image I need, and then register them in GRUB so that when I boot, select the boot partition I need. The bottom line is that GRUB is not able to transfer the download to the ISO 9660 format file system via the "chainloader". Therefore, I had to abandon this idea and use booting from a disk images.