How do you make a Mac OS X Lion boot disc and external boot drive if you have already installed Lion?
iMac 27, Mac OS X (10.7), 12 Gb, 1 Tb, AirPort Extreme
Been asked dozens of times already. Do a search or just look in the 'more like this' pane on the right hand side of this screen.
See : PART 2b: To create a bootable DVD
It will tell you how to do this even if you've alerady downloaded Lion.
http://www.macworld.com/article/161069/2011/07/make_a_bootable_lion_installer.ht ml
If you allready installed Loin the do this. you should be able to force a re-download using one of the following three tricks: First, Option+click the Buy App button in the Mac App Store. If that doesn't work, switch to the Mac App Store's main page and then Option+click the Purchases button in the toolbar. If that doesn't work, quit the Mac App Store app and then hold down the Option key while launching the Mac App Store again. One of these three procedures should get rid of the "Installed" status for Lion and let you download it. Then once it is downloaded again, right click on the Lion download and select show package contence and look for Install Loin DMG and copy it to disk.
How do I make a boot disc & disk if I already installed Lion
