Select the kind of disk you will use for the boot disk. Make sure that the path is correct and then click ‘Create a boot disk’ button.Ĥ. After you click one of the version of OS X above, the application is smart enough to search and detect the available image in the HDD or SSD. This application is able to create a boot disk of Lion (10.7) and Mountain Lion (10.8)ģ. Unzip and run the application, and then select which OS X version you want to make a boot disk of. Format the USB flash disk with Mac OS Extended (Journaled) file system type using Disk UtilityĢ. Here are the step-by-step on how to easily create OS X Mountain Lion USB Boot Disk / Installerġ. For example, I use an 8 GB of SanDisk Cruzer Blade. Since the size of the OS X image is more than 4 GB, you need an 8 GB USB flash drive. You can create a USB stick installer for OS X Mountain Lion. If you wish to install / upgrade other Mac computers, you don’t need to re-download from the App Store. Skip the step by pressing Quit button.Ĭopy the ‘ Install OS X Mountain Lion’ installer app located in Applications folder to another folder elsewhere because the installer app in the Applications folder will be automatically deleted after upgrading. Once it is downloaded, do not continue with the installation step because it will delete the installer file. Downloading new versions of macOS quickly became the norm, no matter how neat this tiny USB key is.You can buy and download the OS X Mountain Lion from App Store to upgrade your older Mac OS X version. It’s a bit of a shame that Lion’s USB installer was a one-and-done thing, but I can’t imagine it sold very well. Lion’s version of Disk Utility has no idea what to make of it, showing it as optical media: It can explored in Finder just like any of Apple’s downloaded macOS installer, and Terminal shows its contents like any other volume. Once I had the new OS up and running, I was curious to see how the system would handle the USB volume. Installing off the USB Key is just like installing Lion from the App Store. It’s just a thin piece of plastic with exposed USB contacts on side that slid right into a USB A port: Physically, the USB key is about as minimal as you can get. I have my own USB installer that I created, but I thought it would be a good time to use the USB installer Apple sold for $69 back in the day.2 While working on a Top Secret project,1 I needed to install OS X Lion on an older MacBook Pro.
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