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From here, you’d sign in with your Apple ID and it would automatically download Lion again and install it.
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Lion set up a secret recovery area on your hard drive so if you needed to reinstall Lion, you could boot up your Mac while holding down ⌘R. In addition, it brought with it the innovative feature called Recovery. Lion set up a secret recovery area on your hard drive so if you needed to reinstall Lion, you could boot up your Mac while holding down ⌘R When Lion was released, it was Apple’s first OS that required no installation media, you just download and intall it. A Full Installer for OS X Mountain Lionīefore Lion, if you ever needed to do a reinstall of OS X, you had to have your installation DVDs handy. Let’s quickly go over each of these services that our drive will do.
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In this tutorial, we’ll be setting up an old external USB drive with some essential software to allow us to boot, fix and reinstall software on a Mac. Mac not booting? Software update went wrong? Need to do a reinstall? These are just some of the reasons why having a diagnostic drive available is something that we all should have (in addition to a good backup strategy, of course).