I'm looking to create a bootable USB memory stick. However the USB stick has data that I can't afford to delete. If I were to burn an iso image on it the ordinary way, say with Ultraiso, the data will be lost.
My idea is to copy the contents of the bootable iso image directly onto the USB stick, (including the boot loader files), and then make it an "Active" partition, I guess that would solve MBR issue. However that doesn't seem to work.
What am I missing here?
Note that my question is in general here, and not about a particular bootable software.
Answer
You can install grub2 on the USB device.
Then you can use grub2 to boot bootable ISO files directly. For this purpose you can either extract linux kernel from the ISO or you can make use of the "loopback" feature of grub2. here
is an example to boot ubuntu
For ISOs that cannot be booted this way, you can then try memdisk.
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