I don’t know what YUMI stands for, but one thing for sure this tool is the greatest tool created for us mere computer mortals. Note that YUMI is a from Pendrivelinux.com, and it is FREE.
With YUMI you can take a simple USB flash drive and turn it into your portable boot-able operating system of your choice.
Personally, I find this tool perfect for recovering a forgotten local administrative password on a computer, or for recovering data from a boot drive where the operating system is no longer boot-able.
To use it, you need a Windows XP/Vista/7 computer to download and run the YUMI utility. You then need to build a multiboot USB flash drive using it by specifying the drive letter where the flash drive is.
In building the multiboot USB flash drive, you will need at least one ISO image of whatever it is you want to boot to. Say for example you have a Trinity Rescue Kit ISO image, and you want to use that to help you recover data from a non-boot-able computer (maybe because OS is corrupted). When you run YUMI, you will need to specify an ISO image, like below:
If you don’t yet have the ISO image, you can check the option “Opted to Download the iso.” After the ISO image is downloaded, you can go to the CREATE phase. Also, before creating, make sure you have the correct USB device selected.
That is pretty much it.