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How to create a OS X Yosemite 10.10 bootable USB flash drive

Creating Mac OS X Yosemite boot installation USB drive is quite easy and includes several simple steps.

To begin you should have a USB flash drive (at least 16 Gb recommended, or external HDD. note that it will be formatted during the process) and a copy of OS X Yosemite installer.

Prepare the usb flash drive

Insert USB drive in your Macbook or iMac USB port, launch Disk Utility app, and select the drive from the list on the left side.

Select the Erase tab. Format the pendrive as Mac OS Extended (Journaled) and click on the Erase button to confirm formatting.

Formatting bootable USB for Yosemite

Then click the Partition tab in Disk Utility

In Partition layout click on the drop-down menu and select “1 partition” (if it hasn’t been already selected)

In Name field on the right change “Untitled 1” to “Untitled” (or something else with no spaces, the name will be used in terminal command later)

Partitionin USB in Disk Utility

Click Options button, choose GUID partition table, and click Ok. Click Apply and confirm the partitioning procedure. Once it is complete, quit Disk Utility.

Creating OS X Yosemite bootable installer

This step is a creating a bootable usb flash drive and copying OS X Yosemite installer onto it.

Open AppStore on your Mac and download OS X Yosemite. Once downloaded the installer will run automatically. You shouldn’t proceed, just quit the installer.

Launch the new Terminal window, which is in your Applications Utility folder, or search Terminal in spotlight.

In Terminal enter the following command

sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createin­stallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Yosemite.app --nointeraction

Hit Return key in terminal, enter your administrator password (the characters will not appear, but you’re entering it) and hit return again.

Copy Yosemite installer onto bootable USB

The copying process will start and it may take a while. Once you see a “Done” message, your Yosemite bootable USB flash drive is created and ready. You may exit the terminal window.

To use created USB OS X Yosemite installer on any macbook or imac, turn off your computer, insert the drive and start the computer again while holding the Option key. In the on-screen menu select Install OS X Yosemite.

One more easy way to make Yosemite bootable drive

There’s one more way to make bootable USB Yosemite installer with DiskMaker X, an app available on App Store. Here are the required steps:

  1. Download OS X Yosemite from App Store
  2. Download DiskMaker X and launch it
  3. In the dialog box select “Yosemite 10.10” Select Yosemite in DiskMaker X
  4. The DiskMaker X will find the downloaded installation on your disk or, if you wish you can point to another one Downloaded copy of Yosemite was found
  5. Select which USB drive you’re going to use
  6. Click “Erase then create the disk” to start copying Yosemite onto USB drive. Create Yosemite installer
In a while working bootable USB with OS X Yosemite will be ready to use for your installations.

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