In theory, you should have to install Mountain Lion only once, or never if your Mac came with Mountain Lion preinstalled.
Delete the Mac OS X 10.7 Lion Recovery HD Partition
And in a perfect world, that would be the case. If you have a catastrophic hard-drive crash that requires you to initialize format or replace your boot drive.
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- Restore Lion to factory/wipe all data.
- Perform a Clean Install of OS X Lion on Your Mac.
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If you replace your internal hard drive with a larger, faster, or solid state drive. If any essential OS X files become damaged or corrupted, or are deleted or renamed. The instructions offered here describe both the process for installing and the process for reinstalling OS X. The OS X Utilities window appears. Click Continue. Click Continue to begin the process of installing or reinstalling OS X.
The system requirements are:. You can install Lion on any internal drive, including SSDs solid state drives.
Erase your Mac and perform a clean install for a fresh start
The Lion Recovery partition takes MB of the free space. The Lion installer creates two partitions, one for Lion and one for recovery tools. You can use the Recovery Partition to repair drives, fix permissions, and format drives, as well as reinstall Lion if needed. The Recovery Partition includes a bootable system with Disk Utility. The target volume should be erased at best; at a minimum, it should not contain any OS X system. With previous versions of OS X installers, you could erase the target drive as part of the installation process.
With the Lion installer, there are two methods of performing a clean install.
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One method requires you to create a bootable Lion install DVD, and the second lets you perform a clean install using the Lion installer you downloaded from the Mac App Store. The difference between the two methods is that to use the Lion installer directly, you must have a drive or partition that you can erase before running the installer. Using a bootable Lion install DVD allows you to erase a drive or partition as part of the installation process.
If you're going to perform a clean install of Lion on a drive other than your current startup drive, then you're ready to proceed. Before you begin the Lion installation process, back up your existing OS X system and user data. Performing a clean install on a separate drive or partition shouldn't cause any data loss with your current system, but stranger things have happened, and it is best to be prepared. At a minimum, make sure you have a current backup. For more protection, make a bootable clone of your current startup drive.
You must erase the target drive before you can start the Lion installation process. Remember that to use the Lion installer as downloaded from the Mac App Store, you must have a working copy of OS X to start the installer from. You may need to create a new partition to install to or resize existing partitions to create the necessary space. Before you start the Lion installer, close all other applications that are currently running on your Mac. After your Mac restarts, the installation process continues.
A progress bar displays along with an estimate of the time it will take to complete the installation. Installation speed ranges from 10 to 30 minutes.
If you have multiple displays connected to your Mac, turn all of them on before you begin the Lion installation process. The installer may display the progress bar on a display other than your usual main screen; if that display isn't on, you'll wonder what's happening.
Explaining the Mac OS X Lion Clean Install
When the installation of OS X Lion is complete, your Mac displays a Welcome window, which marks the start of the registration and setup process for Lion. However, it is better not to use the Migration Assistant at this point, opting instead for a clean installation of Lion. After you know Lion is installed and working correctly, run the Migration Assistant from the Lion installation to move any user data you need to the Lion disk. You can find the Migration Assistant in the Utilities folder inside the Applications folder.
How to Install (or Reinstall) Mac OS X Mountain Lion
Registration is optional. You can click through the next two screens if you want. If you do fill in the registration information, some of the applications you use in Lion are pre-populated with appropriate data. Specifically, Mail and Address Book will already have your primary email account information partially set up, and Address Book will have your personal entry already created. Enter your Apple account information, and click Continue to open a window that requests information. You aren't required to enter it. When you're finished, or if you prefer not to register, click Continue.
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Lion requires at least one administrator account to be set up. You can use the administrator account to perform most Lion housekeeping tasks, to create additional users, and to install any applications that require administrator privileges. The Lion Setup Assistant is just about done.