![]() ![]() I recommend erasing the destination, so be sure to backup any data on the thumbdrive prior to this step! This will take a few minutes to do. (ie THUMBDRIVE in the screenshot) and then click Restore Once you have it chosen, click and drag your USB Thumbdrive from the left pane to the Destination box. Click on the Browse button and locate the. On the right pane, go to the Restore tab.ģ. This is very handy for us Macbook Air users that do not have an external optical drive.ġ. We can then boot the USB Drive on our Mac to install OS X Lion from it. dmg installer file for OS X Lion onto a usb thumbdrive. – USB Thumbdrive or Memorycard Reader w/memory card (4GB mininum, data will be destroyed).– Mac running OS X Leopard or Snow Leopard.– OS X Lion installation DMG (hint: file named: mac_os_x_10_7_11a390.dmg).We will need a copy of the installer dmg (not provided) and a 4GB USB Thumbdrive or Memorycard Reader w/memory card and a Mac to convert the dmg to a bootable usb thumb drive. It just might save your Mac and a lot of frustration that comes along with a crashed PC.This recipe will explain how to make a USB Thumb Drive bootable with the OS X Lion Developer Preview installer on it and in turn allow you to install Lion on a Mac without an optical drive (ie Macbook Air line). But, if it does, it helps to be prepared with a USB stick that can reinstall OS X from scratch. Hopefully none of this will happen to you. If nothing else, you could check out Apple’s new line of iPhones while you wait. If you can convince your local Geniuses of your technical ineptitude, they may also take pity on you and offer to fix the computer for you. As long as you’ve got a good internet connection, it should restore the Mac just fine. Like we said before, you could always try rebooting while holding Cmd-R. Just let the installer do its thing and reinstall OS X. Hit enter to select it and boot up to the installer.Īfter that, it becomes a matter of waiting. Using the arrow keys, navigate to the USB drive. This will display a menu of bootable hard drives. When the computer turns on, hold the Option key. When you need to use the installer stick, plug it into the computer and reboot. Your USB installer stick should be ready! Using the USB Installer Once it’s done, eject the USB stick from Finder. Drag the USB stick from the left-hand menu to the “Destination” spot. Go back to Disk Utility, select the newly formatted USB stick, go to Restore, and click “Image…” Then select the mounted DMG file. Navigate to the Applications folder, right-click on OS X Mountain Lion.app, and select “Show Package Contents.” Go to /Contents/Shared Support and copy “InstallESD.dmg.” Paste it anywhere you can find later. Once that’s done, open a new Finder window. Click the drive in the left-hand column and go to “Partition.”Ĭhoose the “Mac OS Extended (Journaled)” format, then GUID Partition Table. Press Cmd-Space and type in “disk” to open Disk Utility. If you have, go to Purchases, hold down Option, and click “Download.” If you’ve not already bought it, the OS is only $20. If you don’t, try visiting the Apple store and asking for them to help.įirst, download a copy of Mountain Lion from the Mac App Store. You can set all this stuff up before a crash as a precautionary measure (which I recommend). ![]() In order to save your Mac, you’ll need a Mac. Reinstall OS X From a Flash Drive Set up the USB Drive With Mac OS Installer It’s easy- all you need is 8 GB of storage and another Mac. However, if you don’t have internet access or don’t want to wait for the download, you can always try to install OS X from a flash drive. Officially, Apple recommends restarting your computer, holding down Cmd-R, and downloading the necessary software from the internet. That means reinstalling the entire operating system from scratch. Sometimes everything else fails, and you have to start from scratch. Macs are no exception, fanboy wishful thinking to the contrary. ![]()
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