Hybrid ISO
From hacktolive.org
"Ubuntu 11.10 Will Be Distributed As Hybrid CD/USB Images" - Softpedia.com
"Ubuntu ISOs To Finally Double As USB Images" - phoronix.com
"Hybrid ISO/IMG format" - wiki.geteasypeasy.com
http://manpages.ubuntu.com/manpages/precise/man1/isohybrid.1.html
https://lists.ubuntu.com/archives/ubuntu-devel/2011-June/033495.html