Been having some fun trying to get a MacBook Pro to boot from USB. Following some info I got from here https://bugs.launchpad.net/puredyne-live/+bug/508802 I am able to boot from USB and can get partway into the puredyne 9.11 boot process but I run into a problem loading initramfs. It says something about not being able to find a medium.
Right now I have one FAT 32 partition that I simply copied the contents of a Live 9.11 CD into, plus an efi/ that I got from ccobb. I get to a grub menu, I can select my Puredyne menu entry, find the kernel, and start the boot process. It begins to hang at the initramfs part, and returns an error
Unable to find a medium containing a live file system.
This might just have something to do with my GRUB2 config, I have yet to master the intricacies of writing a grub2 menu entry, especially for a live system.