Moderator Note: Split from the existing 10.6 Thread Now that Lion is out, I guess we should find a way to make an emergency Disk on a thumb drive. And I'm not talking about a system install drive (there are plenty of guides out there for that). Besides apple sells a system install drive for $69.99 (outrageous) which I belive can be downloaded by torrents and installed on a pen drive. I talk about a system emergency disk running Lion on which we can install all sorts of utilities like DiskWarrior, DriveGenius etc. Back-in-Time Utility would also be usefull on a disk like that. Finder will be able to run and the whole system would be running normally except the fact that it would be used for recovering data and maintenance operations. I have a drive like that for Snow Leopard, but Lion should be able to make such a drive. When I try to install Lion from the Recovery HD, it reports that I am unable to install it on my disk. Why is that? Is it because the SL installation is on that drive? Do you know of any other way I could proceed make the emergency disk?