On Monday Apple finally unveiled to the world the next iteration of OS X, Mavericks. A developer preview of the new operating system is available now as a Mac App Store download for registered developers. Delivering Mavericks via a download is super conveient and easy for everyday users but can be unhelpful in several troubleshooting or advanced OS modification situations. The only way to obtain a bootable OS X Mavericks USB flash drive is to create your own:

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Oct 24, 2011  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). We will need a copy of the installer dmg (not provided) and a 4GB. InstallESD.dmg contains another disk image, BaseSystem.dmg, which is a bootable installer disk. But writing it directly to the USB drive does not work, because that would create a partition with almost no free space and still lacking some important files.

The Marek Bell blog notes that creating a bootable flash drive of Mavericks is a bit more intricate than Mountain Lion because “it is no longer possible to simply restore the InstallESD.dmg to get a bootable image for USB / Flash drive installation.” But there is a way around this obstacle, which Marek outlines in his thorough walkthrough of creating a bootable OS X Mavericks flash drive. You will need at least a 8GB Flash Drive (USB 3.0 is obviously a better choice).

1. You are going to need to see some hidden files for this. So start by opening Terminal.app and pasting in the following (don’t worry, we’ll undo this change when we are done)…defaults write com.apple.Finder AppleShowAllFiles YESkillall Finder
2. Download the installer as normal from the app store. (At time of writing this is only possible for those with access to the developer previews).
3. After download you will have the ‘Install OS X 10.9′ app in your /Applications folder. Right-click it and select ‘Show Package Contents’.
4. Navigate to the Contents/SharedSupport. There you will see the InstallESD.dmg file. Unfortunately, you can’t just grab it and restore it. Instead double-click it to mount it.
5. You should now see the normally hidden BaseSystem.dmg file in the mounted volume.
6. Open Disk Utility and restore the source BaseSystem.dmg to the destination of your USB drive.
7. Now open up the restored USB volume (default name is OS X Base System) and navigate to System/Installation. In there you will see an alias for Packages. Delete this alias.
8. Copy the full Packages folder from the root of the mounted InstallESD volume (the same place you got the BaseSystem.dmg file) to the USB volumes System/Installation folder. Basically, replace the Packages alias you just deleted with the real Packages folder from the original InstallESD volume.
9. The USB drive should now be bootable. So simply restart, hold down the Option key (Alt) when booting with the USB drive in your machine, and you should get the option to boot from the USB drive.
10. Remember, to rehide the normall hidden files just repeat step 1 but change YES to NO.

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Posted February 28, 2011 by Jimmy S in Apple Mac, Mac OS X Leopard, Mac system administration

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Jul 10, 2012  I found that if I were to only restore the InstallESD.dmg to a USB, it would actually seem to download most of the OS during install after the initial part - a few other people said the same. I am hoping that this method actually ensures the packages are copied from the USB drive - which of course would make for a faster install. Oct 08, 2013  This video explains how you can extract, and burn InstallESD.DMG, the Mac OS X installer file for OX 10.7 Lion, OS X 10.8 Mountain Lion, to a bootable DVD in Windows 7, 8 or Windows 10. Jul 20, 2011  To create a bootable hard drive or flash drive. In Disk Utility, select InstallESD.dmg in the sidebar, and then click the Open button in the toolbar. This mounts the disk image’s volume in the.

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). 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.

Requirements:

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• – OS X Lion installation DMG (hint: file named: mac_os_x_10_7_11a390.dmg)
• – Mac running OS X Leopard or Snow Leopard
• – USB Thumbdrive or Memorycard Reader w/memory card (4GB mininum, data will be destroyed).

This guide lets you restore the .dmg installer file for OS X Lion onto a usb thumbdrive. We can then boot the USB Drive on our Mac to install OS X Lion from it. This is very handy for us Macbook Air users that do not have an external optical drive.

Guide:

1. On your Mac, open up Disk Utility. Click on the USB Drive on the left.

2. On the right pane, go to the Restore tab.

3. Click on the Browse button and locate the .dmg installer for OS X Lion. (ie mac_os_x_10_7_11a390.dmg)

4. Once you have it chosen, click and drag your USB Thumbdrive from the left pane to the Destination box. (ie THUMBDRIVE in the screenshot) and then click Restore

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. Once its finished, you now have a bootable OS X Lion install thumbdrive (basically just like what the Macbook Air ships with).

5. Hold Option/Alt after your see the Apple logo appear and boot with the thumbdrive in your Mac.

Choose the USB Drive to install OS X Lion from your USB Thumbdrive!

• – I would recommend creating a separate partition for your OS X Lion installation as well.

NOTES:

– I have confirmed this working on a Macbook Air 11″, 2010, 1.6Ghz version.

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