Disadvantages: requires an internet connection and new enough firmware since everything is coming over the internet, booting will be slower than with your own recovery drive (and again, reinstalling Lion will require 4GB worth of patience). Advantages: doesn't require any advance preparation as above, you can boot from this and recover from Time Machine and/or reinstall Lion (if you have enough time). Use Lion Internet Recovery (per BJ Homer's answer).Disadvantages: you must create this before removing the old HD, it requires an 1GB or larger flash drive, and since it won't include the full Lion installer you'll need an internet connection (and 4GB worth of patience) to reinstall Lion with it. Advantages: you can boot from this and recover from Time Machine (and/or reinstall Lion if you have an internet connection and enough time). Create a Lion Recovery drive (per my answer above) using an existing Lion system and Apple's Lion Recovery Disk Assistant.Disadvantages: you need to download the installer first (around 4GB), and it requires an 8GB or larger flash drive. Advantages: just like the purchased installer, you can boot from this and reinstall Lion and/or recover from Time Machine without needing an internet connection. Create your own Lion installer drive (per Diago's answer) using a downloaded Lion installer app.Advantages: you can boot from this and reinstall Lion and/or recover from Time Machine without needing an internet connection. Buy a Lion installer (USB drive) from Apple.There are a number of similar options that can be a little confusing, so here's an attempt at clarifying their differences: Its an application that combines our latest driver. Then, after you replace the HD, you can boot from that and use it to reinstall Lion and/or recover your system from Time Machine. DisplayLink Manager is a new way to enable your DisplayLink dock, adapter or monitor on macOS platforms. When it is done, your Mac will restart and you will be presented with Setup Assistant.I'll add yet another option to the list: before you remove the old HD, use the Lion Recovery Disk Assistant to copy its recovery partition to a flash drive.As you can see, mine will install OS X Lion. This will install the original Mac version that came with your computer when you bought it. Now choose Reinstall macOS (or Reinstall OS X) and click Continue.When you erase you data, quit Disk Utility.Make sure that you choose the “Mac OS Extended (Journaled)” format. Select your hard disk, then click erase (under Erase pane). You can do this by selecting Disk Utility then click Continue.
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