There are many reasons why you may want to use a USB Flash drive to install Mac OS X Mountain Lion. If you need to install multiple copies on a few computers, or even prefer not to have to download a new copy every time you have to install the Mac OS. And from what I’ve experienced, installing from a USB Flash drive is faster than installing via downloading a new copy from the Mac App Store or even from DVD. Also USB Flash drives don’t scratch, DVDs do.

Create volume name, choose Options GUID Apply. In Lion SharedSupport folder, copy and drag.dmg file to Disk Utility Source. Drag volume to Destination Erase Destination Restore. To boot: Insert flash drive in Mac and restart. Hold Option key while Mac reboots. In OS X Startup Manager, select bootable drive. Mar 25, 2019 Mac OS X El Capitan 10.11.1 InstallESD DMG Download Category(Operating System)Mac OS X El Capitan 10.11.1 InstallESD DMG Download Latest For Mac. Its full bootable ISO image of Mac OS X El Capitan InstallESD DMG For AMD & intel. Feb 17, 2012 Download OS X Mountain Lion and Extract the DMG File.

The steps necessary to create a Flash drive to install Mac OS X Mountain Lion are fairly simple. There are just certain parts that need extra attention however, I will highlight these areas.

Also check out: How to Install OS X Mavericks from USB Flash Drive

Step 1 of 3 – Preparation

Firstly you actually have to have the OS X Mountain Lion install app downloaded, you can purchase it from the Mac App Store. Once Mountain Lion has been downloaded, you’ll be able to find it in your Applications folder.

If the downloaded Mountain Lion app automatically pops up after downloading, don’t install it yet, just close the window. What we’re looking for is a DMG file. Go to your Applications folder and locate the “Install OS X Mountain Lion” app. Right click it and select “Show Package Contents”. Once opened there’ll be a folder called “Contents”, open it, and finally open the “SharedSupport” folder. Inside this folder there should be 2 files, one called “InstallESD.dmg” and the other “OSInstall.mpkg”, copy the InstallESD.dmg to the Desktop. This will be the file that we’ll be using to create the bootable disk image onto the USB Flash drive.

Step 2 of 3 – Prepare the USB Flash drive

Format USB drive

To create the bootable disk image, your UBS drive has to have at least 8GB of storage. Nowadays USB Flash drive are really cheap and can be purchased at almost any electronics store (the Flash drive I use is 16GB and only cost $15). Plug it into your Mac, and launch Disk Utility (located in Applications/Utilities). We’re going to format the USB drive, so make sure there isn’t anything on it that you need, as formatting will erase everything on the USB drive.

Select the USB drive that is to be formatted, then select the Erase tab. Under the selection for “Format:” select “Mac OS Extended (Journaled)“, and name it anything you’d like. It would probably would be best however to make it something recognizable like “Mac Install” or “Mountain Lion Installer”. Up to you though. Then simply press the “Erase…” button on the bottom right when done. The USB Flash drive will then start to format; in most cases it takes less than a minute.

If you don’t already have a USB flash drive, or want a USB flash drive that is already compatible with Mac OS X then you can purchase one from the MacMall. It’s a good place to buy Mac friendly stuff. Here’s an affiliate link to a 16GB USB drive that comes already properly formatted for the purpose of installing Mac OS X:

For more information on formatting check out my other post: How to Format & Repair a Drive with Disk Utility

Step 3 of 3 – Restore Disk Image

Once your USB flash drive has finished formatting, it’s time to “restore” the drive image. In Disk Utility select the partition that was just formatted and click the restore tab. Make sure to select the partition that you’ve created and not the drive itself. To elaborate, as you can see in the screenshot, I’ve selected the partition I named “Mac OS X Install ESD”, not the drive itself. If you select the drive instead of the partition, then it won’t restore the disk image onto your USB flash drive.

There are two input boxes. One labelled “Source:” the other “Destination:”.

For the “Source:” box either drag the “InstallESD.dmg” file in, or click the “Image…” button, navigate to your desktop and select “InstallESD.dmg”. The destination will be the partition you’ve created. Simply drag the partition that’s on the USB drive that you formatted into the “Destination:” box from the panel on the left of Disk Utility. Next simply press the “Restore” button on the bottom right.

This could take a while to complete, let it do its thing. Once the process is done, your USB drive is ready to go.

If you want to use the USB to format a new computer or re-format your current computer, there are 2 ways of getting it installed. One is to go to System Preferences -> Startup Disk -> and select the USB drive. This will load up the Mac OS X Mountain Lion installer as soon as you restart your computer. The other method is to simply hold down the Options key on the keyboard when your Mac is just turning on after being shutdown/restarted.

Once it’s done booting into the installer it’s a simple process of going through the provided setup steps (easy stuff).

Did you know you can run Mac OS X Mountain Lion from a USB Flash drive? Here’s how: Boot from portable USB disk

You can even boot from an old formatted iPod Classic, here’s a guide: How to Boot and Run Mac OS X from an iPod Classic

Jan 24, 2018 Download Mac OS X 10.11 El Capitan.ISO – Download El Capitan.DMG installer – El Capitan Torrent download – Without using Apple Store ID. OS X 10.11 El Capitan torrent download! Very shortly, in the following words, we show 2 methods to download and get Mac OS X 10.11 El Capitan. Mar 16, 2016 Download Mac OS X Lion 10.7.5.DMG – Mac OS X Lion 10.7.5.ISO – OS X Lion 10.7.5 torrent – Retail DVD uploaded. Clearly, OS X Lion 10.7.x is no longer downloadable from Apple store. However, many our visitors still request this very old version for education purposes.

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• Aug 29, 2011 Hence, you will loose the ability to do another Lion install unless you re-download it again. I keep the 'Install Mac OS X Lion' around on my Applications folder. I also made a bootable drive using InstallESD.dmg. I have three Mac computers so having the bootable Lion install drive makes it easy to install/re-install on all Mac computers.
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How to play a dmg movie on windows. In addition to extracting DMG files, you can use 7-Zip to extract most types of compressed files out there, including ZIP, CAB, ISO, RAR, and WIM, to name just few. Choose “Extract Files” to select a folder where the files are extracted, “Extract Here” to extract files to the same folder where the DMG file is, or “Extract to foldername” to create a new folder named after the DMG file and extract the files to that new folder.The speed of the extraction depends on the size of the DMG file and the speed of your PC.When the extraction is finished, you can browse the files in a regular File Explorer window.You can view or edit the files using any of the regular File Explorer features or whatever apps you use. It also lets you create your own compressed files in ZIP, WIM, 7z, and a few other formats.After installing 7-Zip, you can simply double-click a DMG file to open it and browse its contents.If you’d like to extract the files from the DMG so they’re easier to work with, right-click the DMG file, point to the “7-Zip” menu, and then choose one of the extraction options.

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it’s very simple to convert Lion.DMG (downloaded by the above methods) to Lion.ISO using PowerISO in minutes under Windows or Mac OS X. Otherwise, these following topics would be helpful: http://www.sysprobs.com/convert-mac-dmg-iso-windows.