Creating a bootable USB drive of OS X Yosemite 10.10 if you want to save it on a external drive for future usage or just want to install it on multiple Mac computers. To make OS X Yosemite bootable USB installer drive, there are few requirements. Lets see what are those. Mac applications download.
Note: This guide to make installer USB drive is for OS X Yosemite Developer Preview
See also: Dual Boot OS X Yosemite and Mavericks
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Make OS X Yosemite Bootable USB
Oct 09, 2013 - The file you download will likely be a.dmg with 'Install OS X Mavericks.app' inside. Mount the.dmg and copy 'Install OS X Mavericks.app' into your Applications folder. Attach an 8GB (or larger) USB flash drive, and open Disk Utility. Prepare USB drive for OS X Yosemite. Open Disk Utility from “Applications” “Utilities” or press “cmd+space” keys form keyboard to find “Disk Utility”. Plug the external USB drive into Mac (make sure you save your stuff from it). Once you attached the USB drive, it will shown on the left panel of Disk Utility.
Prepare USB drive for OS X Yosemite
Open Disk Utility from “Applications” > “Utilities” or press “cmd+space” keys form keyboard to find “Disk Utility”.
Plug the external USB drive into Mac (make sure you save your stuff from it). Once you attached the USB drive, it will shown on the left panel of Disk Utility.
Select the drive and then do the following steps to create a single partition that is required to make USB installer drive for OS X Yosemite 10.10.
Click on “Partition Layout” drop-down menu and select “1 Partition” option from it.
Then enter the Partition information Name: ”osxyosemite”, Format: “Mac OS Extended (Journaled)”. Click the “Options” button to select the partition scheme, so select “GUID Partition Table” option and click OK button.
To complete the creating partition process hit the “Apply” button and then “Partition” button. This will take some time to format and making USB drive as a 1 partition. Once done, you will notice a new drive name will be displayed on the left side, the name that you given in the partition information. Now close the Disk Utility tool.
Show hidden files
Showing hidden files is required, because there are few hidden files in the OS X Yosemite installer package that you need to unhide first to write them on bootable USB drive.
Open Mac “Terminal” command line: press cmd+space keys and type Terminal in the spotlight, click the Terminal from search results or just open the Terminal from Applications > Utilities > Terminal.
Type the following two commands one by one:
defaults write com.apple.finder AppleShowAllFiles YES
Killall Finder
First command is going to show hidden files and the second one is to restart the Finder so we can see the instant effect of first command. Close the Terminal.
Open Applications, here you will see your downloaded OS X Yosemite file “Install OS X 10.10”. Cmd+click on it to view the menu, select “Show Package Contents”.
Open “Contents” > “SharedSupport” folder and here you will see “InstallESD.dmg” file, double click to open the file and OS X may starts verifying this file so let the verification process finished.
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After that you will see a folder with the following content in it, “BaseSystem.dmg” is the file that we need and it was hidden, so now you know that why we show the hidden files in above steps.
Open the Disk Utility again from “Applications” > “Utilities” > “Disk Utility” or by using Spotlight search.
Load the “BaseSystem.dmg” file into the Disk Utility, right-click on the file and choose “Open With” > “Disk Utility” option. After doing that open the Disk Utility and you will see the file “BaseSystem.dmg” is loaded in the Disk Utility on the left side.
Create Bootable Usb From Dmg Mac MavericksRestore Disk Image
Now we are going to restore “BaseSystem.dmg” disk image on the USB drive.
Select your USB partition that we created in previous first steps, then click the Restore tab. Under Restore tab there are two fields, Source and Destination. Click and drag the “BaseSystem.dmg” to Source field and “osxyosemite” usb drive to Destination filed, see screenshot below to get more idea. When done hit the Restore button and you need to confirm “Are you sure you want to replace the content on USB drive with the content of disk image” so click the Erase button to confirm, after that you may need to enter the administrator password. Restoring disk image is time taking process so be patient. Make Bootable Mavericks Usb From Dmg
Once the restoring disk image process is finished you will see a folder like this. Here, open the “System” > “Installation” folders and move the Packages file to trash.
Make Bootable Dmg In Windows
Copy the “Packages” folder from the folder where the “BaseSystem.dmg” exist. and paste it into the Installation folder that you just opened in previous step.
Hide the system files again using this command
defaults write com.apple.finder AppleShowAllFiles NO
How to Boot from USB Drive
You must know the system requirements of OS X Yosemite before installing it, If your system to capable to run this OS X version 10.10 then Shutdown your Mac, plug the OS X Yosemite Bootable USB into Mac. Press the power button again to turn it On and then hold the Alt or Option key from keyboard, when you see this screen release the button. Double click on the USB drive to boot from it.
Congratulations! you successfully perform all steps to make bootable USB drive to install OS X Yosemite on more that one Mac computers without worried of downloading it on each computer separately, you will saved lot of bandwidth and time as well. Thanks for reading if you have any problem we are here to help you just write your problem below in comments box.
Related Content
Download Mavericks dmg is the best application you need to try if you need to upgrade or downgrade your Mac OS X. This application is popular because of the 100% success that has been achieved. Using this application you can upgrade or downgrade your OS in two methods. The first method is installing maverick on an empty volume. Which does not need to keep any backups of the OS? The second method is installing the app in the startup. This case you need to keep a backup of your current OS version. There are tools you can use to get backups on your computer OS. This Mavericks can be downloaded from the Apple App store. So you don’t have to worry about searching for a correct version.
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In this method, you do not need to get backups of the OS version. You have an empty volume to install the application. You can also install this Mavericks app while your device is booting and startup process is on the go. In this case, you can save a lot of time without waiting until the installation is done.
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Download Mavericks dmg can be used and installed in the startup volume. But before that, you need to get backups of the currently using OS. You might not be able to see some files and applications after upgrading or downgrading.SO keeping a backup is safe and a must. And you need to create a bootable USB drive in order to use this installer. And after that, you can start the process.
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Download Mavericks dmg needs backups in the second method we mentioned above. There are so many software and tools online you can get backups of the OS. But you should find and choose the best backup tool before you upgrade or downgrade. After the backup process, you can ensure it by checking the system preferences. And go to the startup disk pane and booting the device backup. Here are some recommended backing up clones for you to choose from. Mac Backup Guru, SuperDuper, Carbon Copy Cloner are some recommended tools. These are some of the best backup tools for Mac OS X.
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Download Mavericks is compatible with iMac ( After 2006 iMac versions), Mac Book and Mac Book Black/White (the year 2008 and 2009 upwards), All Mac Book Retina Models, Mac Book Pro 15 inch, Mac Book Pro 17 inch, Mac Mini (2007 or later), Mac Book Air 2008 or later, Mac Pro (2008 or later), Mac Book Pro 13 inch (2009 or later), Xserve (2009)
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To use this Download Mavericks you need at least of 2 GB of RAM, 8 GB storage, OS X 10.6.8 Snow Leopard and above.
Using Download Mavericks dmg
Install the Download Mavericks Mac application from the apple store. This will be around 5 GB. After the download follows the instructions mentioned on the official site. Or you can follow video tutorials to continue.
Create Bootable Usb Mavericks Dmg On Windows
Download Mavericks dmg is the best way you can upgrade or downgrade your Mac OS X. so hurry up and try it out now.
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