These can contain just about any tool you want: anti-virus, OS boot cd's, OS repair / recovery discs, programs, etc.)
This is a slightly more difficult section depending on exactly what you want on your flash drive.
This can also be time consuming.
Different programs and bootable
Windows and Linux ISO's require different boot parameters. Which is why
some things work with one program and not another.

SARDU, XBOOT, and YUMI can create a multiboot utility flash drive but each officially support different programs / ISO's.
EasyBCD can create multiboot flash drives but requires you to PAY ATTENTION when configuring.
You'll have to find which actually work best for you.
I haven't found one that does everything I would like it to (do all the
programs below and work) so I've got 2 utility / rescue flash drives

:info:

http://www.tweakhound.com/usb/usb5.html

View the full article