Now, let’s move to the actual tutorial to create bootable OS X Yosemite USB, Connect your USB drive with Mac. Start ‘Disk Utility’. Select USB drive from the left sidebar. Click on ‘Erase’ tab from right. Now, click on ‘Erase’ button. (MAKE SURE THAT THE TITLE IS SET TO ‘Untitled’ AND THE FORMAT TO ‘Mac OS Extended (Journaled)’.
Requirements. You must have an external USB drive or storage media with capacity of at-least 8GB (Save data from it because we are going to format it). OS X Yosemite installer downloaded 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.
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.
Restore 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. 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. 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 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. 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.
Note: As mentioned, these steps are for the OS X Yosemite Developer Preview, which is provided to registered members of the Mac Developer Program. If you’re a consumer using the free Yosemite Public Beta, follow. Step 1: Obtain the Yosemite Developer Preview Installer Download the OS X Yosemite Developer Preview installer from the Mac App Store.
This will put a file called Install OS X 10.10 Developer Preview.app in your /Applications folder. It will also launch the Yosemite installer app when the download completes. Quit the app by pressing Command+Q. Step 2: Format and Prepare USB Drive Grab a USB flash drive that’s at least 8GB in size. While it’s possible to create a separate partition for the Yosemite USB installer, it’s safest and easiest to use an empty drive or one that you don’t mind erasing.
Plug the drive into a Mac running OS X 10.7 Lion or higher and launch Disk Utility from the /Applications/Utilities folder. In Disk Utility, select the USB flash drive from the list on the left. Note that you want to select the drive and not the volume. We’re using a flash drive, so in our case we choose 8 GB SanDisk Cruzer Media and not the default “No Name” volume. With the USB drive selected, choose the Partition tab on the right side of the window.
The partition scheme and volume properties of your flash drive will vary depending on manufacturer and previous configuration. In our case, our drive is brand new and formatted as a FAT volume with a Master Boot Record partition scheme. This won’t work for Yosemite, so we need to change it. In the drop-down menu under Partition Layout, choose 1 to create a single new partition.
Then click Options, choose GUID Partition Table, and click OK to save the change. Under Partition Information, change Format to Mac OS Extended (Journaled) and give the drive the name “Untitled” (this allows your drive to work with the Terminal commands below; you can rename the drive when the process is complete). Press Apply to restructure the USB volume with the new parameters. Note that this will erase all contents of the USB drive so, as mentioned above, be sure to back up any files on the drive or use a blank drive to begin with. Step 3: Modify the Yosemite Installer’s Preference File This is one step that consumers running the public Yosemite beta don’t have to worry about. By default, the process of creating a bootable Yosemite USB installer via the method outlined in this article won’t work unless we make a slight change to a.plist file in the Yosemite installer app. Locate the Install OS X 10.10 Developer Preview.app file in your Applications folder, right-click, and choose Show Package Contents.
Then open the Contents folder and find Info.plist. Open this file in your text editor of choice and find the line CFBundleShortVersionString. The default value for this key, listed in the string below it, is 1.4.3. Change this to 1.4.1, and save the file, authenticating with an admin password if requested. Step 4: Create the Bootable Yosemite USB Installer with Terminal Now that the Developer Preview’s preference file has been modified, we can complete the process of creating a bootable Yosemite USB installer with a simple Terminal command. Open Terminal from /Applications/Utilities and then enter the following command: sudo /Applications/Install OS X 10.10 Developer Preview.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -applicationpath /Applications/Install OS X 10.10 Developer Preview.app -nointeraction Press the Return key on your keyboard to execute the command, and enter your admin password when requested.
This will create a bootable Yosemite USB installer using OS X’s createinstallmedia tool, which can take quite a while depending on the speed of your flash drive. Let the tool do it’s thing and don’t interrupt the process until you see Terminal output Done and return your window to the user prompt.
When it’s complete, you’ll see that your USB flash drive is now mounted to your desktop with the name “InstallAssistant.” You can now rename this drive (highlight it on the Desktop and press Return), as well as supply it with its own. Eject your new Yosemite USB installer and connect it to any Mac you wish to upgrade to the Yosemite Developer Preview. Reboot the Mac holding the Alt/Option key on the keyboard and you’ll see the installer appear in the EFI boot menu. Select it and follow the prompts to install OS X Yosemite. Want news and tips from TekRevue delivered directly to your inbox?
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