1. Install Yosemite On Disk Utility
2. Create Yosemite Usb Install Disk Utility
3. Yosemite Install Disk Download

Now, before you install OS X Yosemite, you’ll want to erase and reformat your hard drive, so at the Install OS X screen, go up to the menu bar at the top and click on Utilities Disk Utility.

Want to learn how to create a bootable USB installer for OS X Yosemite?. Here is the complete step by step guide which you can follow on your MAC create the bootable USB disc. We all know that Yosemite OS X is the latest operating system form Apple, which comes with lots of new features and improvement. If you are interested in new OS and want to try it then sign up for the OS X Beta Program here, which will allow them to test the new OS, if selected.

Once you have the installation app for Yosemite (Install OS X 10.10 Developer Preview), don’t install it directly, other wise you will lose the file and can’t make the USB disc. To get started all you nee a *GB or above USB drive, Apple computer with Mac App Store (10.6.8+) and OS X Yosemite installer.

1. It installs an app named Install macOS Sierra into your Applications folder. OS X El Capitan downloads as a disk image that contains a file named InstallMacOSX.pkg. Open this file and follow the onscreen instructions. It installs an app named Install OS X El Capitan into your Applications folder. Install Yosemite Dmg From Usb Adapter.
2. Jun 18, 2014 Once you have the installation app for Yosemite (Install OS X 10.10 Developer Preview), don’t install it directly, other wise you will lose the file and can’t make the USB disc. To get started all you nee a.GB or above USB drive, Apple computer with Mac App Store (10.6.8+) and OS X Yosemite installer.

Create OS X Yosemite Bootable USB Drive

Step 1. Insert the USB drive or Disc on youir MAC and run the Disk Utility app from the Applications > Utilities folder.

Step 2. Now in the app select the USB drive and Selct the Partition Tab.

Step 3. Under Partition Layout, select 1 Partition from the drop-down menu. And enter the Partition information Name: ”yosemite”, Format: “Mac OS Extended (Journaled)”.

Step 4. Click the Options... button and Select GUID Partition Table. After that hit the “Ok” button then “Partition” button.

Step 5. Now the partition process will start and this will take some time to format and making USB drive as a 1 partition

Now the USB part is over and lets move to the OS X Yosemite installer package.

Step 6. Go to Applications again and find the Install OS X 10.10 Developer Preview app that you downloaded.

Step 7. Right-click the installer and select Show Package Contents from the context menu. See the Screenshot below:-

Install Yosemite On Disk Utility

Step 8. Now navigate to Contents -> SharedSupport and open InstallESD.dmg

Step 9. This will start the verify process on your MAC. Wait for some time…….

Step 10. Once the verify process is done you will see the Package Folder.

Step 11. Don’t do anything with this Packages folder just yet. First, we need to unhide the files located in this newly mounted OS X Install ESD image.

Step 12. Launch Terminal.app to enter a command to unhide the file and folder on your MAC.

Step 13. Enter the below mention two commands one by one:-

Create Yosemite Usb Install Disk Utility

defaults write com.apple.finder AppleShowAllFiles TRUE

killall Finder

Step 14. Now you will see three more files next to the Package folder (Step 10)

Step 15. Switch back to Disk Utility.app to select the partition name created in step 3.

Step 16. Now drag the partition from the device list to the Destination box. Also, drag the BaseSystem.dmg to the Source path
Hit the Restore button.

Yosemite Install Disk Download

Step 17. Now a new popup screen appears. From here click on Erase to start the restore process, then enter in your admin password and hit OK to proceed.

Step 18. Once the restore process is done, you will see a new window son your screen. Like the screen below:-

Step 19. Here, open the “System” > “Installation” folders and move the Packages file to trash.

Step 20. Now copy the Packages folder from Step 10 and paste it into the Installation folder that you just opened in previous step.

Step 21. Now Hide the system files again using this command on terminal window

defaults write com.apple.finder AppleShowAllFiles NO

That’s it!. To perform a clean install on your MAC, simply insert the USB drive that you created, power on the computer, and hold down the [option] key to access the boot selection menu. From there, select the USB drive partition, and follow the prompts to install OSX 10.10 on your Mac.