The latest debian iso images support bot ... / 2012-09-17

The latest debian iso images support both USB and CD booting, the image can both be burned to cd and copied to a USB key, simply as

# cat debian.iso > /dev/disk/by-path/..usb..; sync

I was wondering how that was done, and found Further adventures in EFI booting - mjg59 which mentions Hybrid cd-rom/harddisk mode in isolinux and a simple explanation at How the Hybrid ISO/IMG works.

It's an interesting trick. And with isohybrid it's easy to implement.