Dan Frakes at Macworld details the steps for creating a bootable installer disc or drive for Mac OS X 10.7 Lion, which is important especially for Macs that debuted after the release of Lion (as they don’t include a downloadable version of the installer). While nicely thorough and practical, it’s also notable for a hair-raising maneuver to avoid re-installing Mac OS X and zapping your Mac’s PRAM. follow link
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Action-Packed Instructions for Creating a Bootable Lion Install Drive