İt is possible to make a bootable restore medium of OS X Lion for using in case of emergencies. However ,it is not so simple for some users. Luckly, a new application “Lion Diskmaker will do the everything for you only with one click.
The process is really simple and fast. Lİon Diskmaker locates your lion installer . Then, it turns it into your bootable lion installer USB KEY
The more information is available and you can download Lion Disk maker over at the developer’s website.