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Make sure that you won’t need any of the contents of the flash drive, if you do, keep a backup of it somewhere first. While you wait, get a coffee, a break and a USB drive with at least 8 GB capacity. Note that this may take up between 10 and 60 minutes, depending on your Internet connection speeds. If you’ve previously purchased a copy of Mountain Lion, don’t worry, you will not be recharged. Re-enter your App Store credentials if required. Look for OS X Mountain Lion, hold down the Option key and click Download. Launch App Store, and go to the Purchases tab. Here’s how you can download and obtain a soft copy of Mountain Lion. The installer you downloaded fro the App Store automatically deletes itself after you’ve successfully upgraded your Mac. Re-Download Mountain Lionįirst, grab hold of a copy of the Mountain Lion installer file.
#Mac os lion download usb how to#
Recommended Reading: How to Clean Install OS X Mavericks 1.
#Mac os lion download usb mac os x#
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Here is a breakdown of the steps involved: With that cleared up, in this article we will show you how to erase existing data and reinstall a brand new copy of Mountain Lion. A clean install will give you peace of mind.
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Two, you are thinking about trading or gifting your machine to someone else, but you are concerned with the remnants of files, profiles and various credentials that if mishandled, may lead to a security leak. To optimize your Mac, it is quite necessary to reinstall and start from a clean slate. Here are couple of reasons we can think of: One, your existing Mac OS X inherited documents, files and applications that take up a lot of unnecessary storage space. But first, why should you clean install the Mac OS X Mountain Lion at all? Unfortunately in Mac the process can be a little more complicated and less well known. You can restore from a Time Machine backup, reinstall OS X Lion over the Internet from Apple's servers or use Disk Utility to repair or erase a disk.In the Windows’ analogy, this is like reformatting your Macbook or iMac and reinstalling a brand new version of Mac OS X Mountain Lion. Hold down Command-R during startup to boot into the Recovery HD, or hold down the Option key during startup and select Recovery HD. OS X Lion includes a built-in set of tools for repairing your Mac in the Recovery HD, a new feature that lets you repair disks or reinstall OS X Lion without a physical disc. It is also useful if you need to install Lion again, though there are already recovery features built into Lion. You can now take the install USB stick to another Mac you own or control and install Mac OS X Lion without needing to download the 3.76GB file again. button and navigate to where you copied the InstallESD.dmg file.įor Destination drag the USB stick from the drive menu to the Destination field. The reason that a 4GB stick is too small is that if you format the USB stick as Mac OS Extended then you only have 3.66GB of space which isn't enough for the Lion install dmg file.įor the Source click the Image. I created these screenshots using a 4GB stick, however this is too small and you will need a bigger stick for it to work. This application will allow you to burn the.
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Open Applications -> Utilities -> Disk Utility Navigate to.Ĭopy the InstallESD.dmg file to another location such as your Documents or the Desktop. Right click and click and Show Package Contents Locate the install file in Applications, or right click the Install Icon in the Dock. If the Lion installer starts after downloading, quit the install programme. The key is to download the Lion installer, but do NOT install Lion! This will also allow you to then install Lion on the other Macs you own or control without downloading the 3.76GB file each time. If you try this process with a 4GB USB stick it won't work, even though the installation file is only 3.76GB. You will need an USB stick bigger than 4GB, so either an 8GB or 16GB stick. Fortunately it is pretty simple to image the installation application to an USB stick. However if you have slow broadband or a bandwidth cap, downloading each time can be problematic. The Mac App Store makes this very easy to do, on each computer you own or control you can go to the Mac App Store and download Lion again for no extra charge. (i) to download, install, use and run for personal, non-commercial use, one (1) copy of the Apple Spftware directly on each Apple-branded computer running Mac OS X Snow Leopard or Mac OS X Snow Leopard Server ("Mac Computer") that you own or control Under the terms of the licence for personal, non-commercial use only you are able: Lion was released on the 20th Jully 2011 as a paid download from the Mac App Store. How do I create an install USB Stick from the Lion download?