I have an Ubuntu 10.10 / Windows 7 dual boot environment. Occasionally, I want to boot directly off a USB stick or USB-connected portable HD and either by-pass the dual-boot GRUB loader or add a boot option for the bootable USB device(s).
Note: The USB boot option is set as a higher prior than the HD option in the BIOS, and the USB devices boot as expected in a single OS environment.
Problem: In a dual boot GRUB environment, the BIOS priority setting is essentially ignored.
What is the best approach to booting off a USB device in this scenario, adding "cdrom-detect/try-usb=true" to an existing GRUB entry...or another solution?