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. 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.
Install OS X Lion Using a Bootable DVD
Once all the necessary files are copied to the target disk, your Mac will restart. After your Mac restarts, the installation process will continue. A progress bar will display, with an estimate of the installation time, which can run from 10 to 30 minutes.
Once you see the installation progress bar, the install process is identical to steps outlined in the following article:. Share Pin Email. Tom Nelson has written hundreds of articles, tutorials, and reviews for Other World Computing and About. He is the president of Coyote Moon, Inc. If you have a current backup, we're ready to continue.
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Restart your Mac. Once you see the Apple logo and the spinning gear, you can release the C key.
Mini-Tutorial: Inability to boot from Mac OS X CD/DVDs; solving
Click the Erase tab. Give the disk a name, such as Lion, or maybe Fred; whatever you like.
Now insert your disk or USB drive. Make sure the drive is empty and that there is only one partition. For a clean install of Mountain Lion on any compatible Mac, follow these steps:.
For more on Mountain Lion, be sure to read the official Cult of Mac review. Cult of Mac.
How to select a different startup disk
Today in Apple history: iPad mini arrives. But if the drive the recovery partition is on goes bad, you're out of luck. For this and many other reasons, we're going to show you how to create a bootable version of the OS X Lion installer. Sometimes referred to as a clean install, this process lets you install Lion on a disk that is empty or has no pre-existing OS installed on it. In this article, we're going to use the bootable OS X install DVD you created to install Lion on a disk you will erase as part of the installation process.
Use Startup Manager
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.
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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. 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.