Before we begin, remember that you will be erasing one of your volumes to use as the target for the Lion install. You should have a complete, current backup of that drive, because all data on the drive will be lost. As soon as your Mac restarts, hold down the C key. This will force your Mac to boot from the DVD. The boot process will take a long time, so be patient. Be sure to turn on all monitors that are connected to your Mac because in some multi-monitor setups, the main display may not be the default monitor used by the OS X Lion installer.
Disk Utility will open and display a list of connected drives. This process can take some time, so be patient.
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Select the disk you wish to be the target for your OS X Lion install. Remember that we're going to erase this disk, so if you haven't performed a current backup of the data on the disk, stop and do it now. If you have a current backup, then you're ready to proceed. Select the disk you wish to erase.
A drop-down sheet will appear, asking you to confirm that you wish to erase the target disk. Click Erase. Disk Utility will erase the drive. A drop-down sheet will appear, asking if you agree to the license terms.
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Click Agree. A list of disks will appear; select the disk you wish to install OS X Lion on. This should be the same disk you erased earlier. Click the Install button. The Lion installer will copy the necessary files to the target disk. The installer may also download necessary components from the Apple web site.
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In our installation tests, there were never any downloads, but this feature may ensure that the installation has the latest updates, and there may not have been any current updates. A progress bar will display, with an estimate of the time to copy the needed files. Once all the necessary files are copied to the target disk, your Mac will restart.
After your Mac restarts, the installation process will continue. You receive a content code to the Mac App Store, usually within one day. After you download the installer, copy it to any Mac that meets the minimum hardware requirements and install Lion. The Lion installer is downloaded to your Applications folder, and it is just under 4 GB in size. The system requirements are:. You can install Lion on any internal drive, including SSDs solid state drives.
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. 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.
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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.
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. 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.