Performing a clean install of OS X Mountain Lion erases all the data on the target disk. It contains a bootable system with utilities for performing basic disk repair, as well as the ability to reinstall the OS if necessary. This is a hidden partition created by the Mountain Lion installer. 650MB of free space for the Recovery HD partition.A minimum volume size of at least 60GB provides sufficient room for the OS, user data, apps, and some free space. You can squeeze Mountain Lion onto a smaller drive, but there won't be much space left for user data and applications.
The target volume must be at least 8GB in size. You also need a Mac running OS X Snow Leopard (10.6) or later to access the Mac App Store. The OS X Mountain Lion minimum requirements guide lists the Macs that can run Mountain Lion, as well as recommendations beyond the minimum. So to keep all your files you’ll need to either (1) upgrade to Snow Leopard first or (2) do a time machine backup before you erase everything, then ‘restore’ from the time machine backup when you install Lion.Screen shot courtesy of Coyote Moon, Inc. NOTE: IF you want to keep all your files and settings this won’t work. Now Quit out of ‘Disk Utility’ and you will be able to install Lion on your freshly erased Mac. THIS WILL DELETE ALL YOUR FILES OFF YOUR COMPUTER AND YOU WILL LOSE THEM.Ĥ.
Don’t install Lion, instead go to ‘Disk Utility’ and then ‘Erase’ your main Hard Drive. To do this restart and hold down option key until you get a choice to boot from your Hard Drive or the USB Lion. To get a Lion installer you can purchase one on a USB thumbdrive from Apple Store ready to go, or you can purchase and download Lion online from Apple and then make a USB installer – see this post for how.Ģ. I had to delete the old version of OSX, then install Lion from the USB thumbdrive. Here’s how to do a fresh install of Lion.ġ. After installing Lion on my iMac, I wanted to delete everything on my laptop and do a fresh install of Lion. But the installer will not install over an older version of OSX. If you have a Lion installer on a USB thumbdrive, you can use it to upgrade your Mac from Snow Leopard to Lion, but if you have an older version of OS X you can’t upgrade. You need to first upgrade to Snow Leopard OR you can erase everything and do a completely fresh install of Lion.
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