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*Download Bootable Mac Os Disk
*How To Create A Bootable Mac Os X Yosemite Usb Flash Drive
After it’s done, you should be able to use your USB Flash drive as a bootable disk to install OSX 10.10 Yosemite on any MAC computer. Note: The Bootable USB Flash drive would not only be used to install Yosemite on Mac computers, but would also have utilities like Disk Utility and Time Machine recovery. Using Diskmaker X is the easiest way to burn or make a bootable USB Flash drive. Here is how to go about it. You need to download the Yosemite installer as stated above from the Mac App Store and DiskMaker X. Insert your 8GB (or larger) flash drive into your MAC. (How To) Make A Bootable OS X Yosemite USB On Windows EXPAND THE DESCRIPTION FOR GOLD! Hey guys thank you so much for watching this video, If it helped you d.
Bootable USB Installers for OS X Mavericks, Yosemite, El Capitan, and Sierra

First, review this introductory article: Create a bootable installer for macOS. Second, see this How To outline for creating a bootable El Capitan installer. Simply replace the Terminal command with the one from the preceding article by copying it into the Terminal window. You will need an 8GB or larger USB flash drive that has been partitioned and formatted for use with OS X.

Drive Partition and Format
*Open Disk Utility in the Utilities’ folder.
*After Disk Utility loads select the drive (out-dented entry with the mfg.’s ID and size) from the side list.
*Click on the Erase tab in the Disk Utility toolbar. Name the drive, ’MyVolume’. <---- IMPORTANT!
*In the drop down panel set the partition scheme to GUID. Set the Format type to Mac OS Extended (Journaled.)
*Click on the Apply button and wait for the Done button to activate. When it does click on it.
*Quit Disk Utility.

Create Installer
Open the Terminal in the Utilities’ folder. Choose the appropriate command line (in red) depending upon what OS X installer you want. Paste that entire command line from below at the Terminal’s prompt:

Command for macOS High Sierra:
sudo /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install macOS High Sierra.app
Command for macOS Sierra:
sudo /Applications/Install macOS Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install macOS Sierra.app
Command for El Capitan:
sudo /Applications/Install OS X El Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install OS X El Capitan.app
Command for Yosemite:
sudo /Applications/Install OS X Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install OS X Yosemite.app
Command for Mavericks:
sudo /Applications/Install OS X Mavericks.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install OS X Mavericks.app

Press RETURN. You will be asked for your admin password. It will not echo to the Terminal window. Then press RETURN again. Wait for the return of the Terminal prompt signifying the process has completed. It takes quite some time to finish. Be patient.
Sep 13, 2018 1:16 PM
Update: Go to Install macOS Sierra Using Bootable USB Flash Drive if you want to install macOS 10.12 Sierra instead.
Update 2: The instructions below will work to manually create a Mac OS X 10.11 El Capitan USB installation drive. I needed to upgrade my sister’s 2008 Macbook Pro and found that the existing Mac OS X 10.6 Snow Leopard did not support the “createinstallmedia” tool; I got a “Failed to start erase of disk due to error (-9999, 0)” error. I followed the instructions below to successfully create a bootable installer for Mac OS X 10.11 El Capitan, which is the last version to support the 2008 Core 2 Duo Macbook Pro.
In this post, I will go over instructions on how to create a bootable USB flash drive containing the Mac OS X 10.10 Yosemite installer. These instructions will also work for Mac OS X 10.9 Mavericks (excluding a Yosemite-specific step) and differ significantly from the instructions for creating a Mac OS X 10.6 Snow Leopard installer. You will need an 8GB USB flash drive for Mac OS X Yosemite or Mavericks.
I tried several methods which failed to create a bootable USB flash drive before finding one that succeeded. The instructions I found that worked, using Disk Utility, were located at How to Make a Bootable OS X Mavericks USB Install Drive and How to Create a Bootable Install USB Drive of Mac OS X 10.10 Yosemite.
Download the Mac OS X 10.10 Yosemite
First, download the latest Mac OS X version, which is 10.10 Yosemite. It is the version currently available for download from the “App Store”. (If you want an earlier version like Mac OS X 10.9 Mavericks, you’ll need to get it from elsewhere.)Download Bootable Mac Os Disk
Launch “App Store” and search for “OS X Yosemite”. Download it. (It is 5.16GB in size.)
Note: If you run the Yosemite installer to upgrade your Mac, the downloaded installer file will be deleted automatically after the upgrade is completed. To keep that file, you will want to move it out of the Applications folder so it won’t be deleted after an upgrade. Launch the “Terminal” app and run this command to move the downloaded installer app to your user’s “Downloads” folder:sudomv/Applications/Install OS Yosemite.app/ ~/Downloads/
Create Bootable USB Flash Drive InstallerHow To Create A Bootable Mac Os X Yosemite Usb Flash Drive
By default, the Finder will hide system files which we will need to see. Run these commands in the “Terminal” app to expose the hidden files:# Configure Finder to show hidden system files.defaults write com.apple.finder AppleShowAllFiles TRUE# Close all Finder instances (and re-launch so settings take effect).killall Finder
Prepare the USB flash drive:
*Plug in a USB flash drive of size 8GB or larger.
*Launch the “Disk Utility” to format the USB Flash drive.
*On the left-hand pane, select the USB drive (not the partition under it, if any).
*Click on the “Erase” tab, select “Mac OS Extended (Journaled)” for “Format” and input a name like “Install Yosemite” (or anything because this name will be overwritten later).
*Click the “Erase…” button at the bottom and then the “Erase” button in the popup dialog. This format operation should take less than a minute to complete.
Restore the Yosemite installation image to the USB flash drive:
*Launch the Finder and locate the “Install OS Yosemite.app” file. Right-click (hold the “control” key and click) on it and select “Show Package Contents”.
*Open Contents, then SharedSupport, and double-click on the InstallESD.dmg (disk image) file to mount it. A volume called “OS X Install ESD” will show up on the desktop and under DEVICES in the Finder.
*In the “OS X Install ESD” volume, right-click on the “BaseSystem.dmg” file and select “Open” to mount it. (Double-click won’t perform any action because it is a hidden file.)
*Use Disk Utility to clone the “BaseSystem.dmg” to the USB flash drive:
*Select the “BaseSystem.dmg” in the left-hand pane and click on the “Restore” tab. The “Source” field will be populated with “BaseSystem.dmg”.
*Drag the “Install Yosemite” partition under the USB flash drive to the “Destination” field.
*Click the Restore button and then the Erase button.
*The USB flash drive will be written with the contents of “BaseSystem.dmg” file. Depending on the speed of your USB flash drive, it may take several minutes or longer to complete this operation.
*Once complete, the “Install Yosemite” partition will be renamed to “OS X Base System”.
*Use the Finder to navigate to the USB flash drive. You will see two “OS X Base System” volumes in the Finder’s left-hand pane. The USB flash drive is the last one.
*Under the USB flash drive’s “OS X Base System” partition, open the “System/Installation” folder. You will see an alias file named “Packages”. Delete it because we will replace it with a “Packages” folder below.
*Use a second Finder window to open the “OS X Install ESD” volume. (To open a second Finder window, you can use the Finder menu’s “File/New Finder Window” command.)
*Copy the “Packages” folder from the “OS X Install ESD” volume to the USB flash drive’s “System/Installation” folder.
*Required for Yosemite (not required for Mavericks): Copy the “BaseSystem.chunklist” and “BaseSystem.dmg” files from the “OS X Install ESD” volume to the USB flash drive’s root “/” folder. If you don’t do this, you will get an “undefined error 0” when attempting to install Yosemite.
*The USB flash drive is now complete. You can use it to boot a Mac to install Mac OS X 10.10 Yosemite.
*Unmount all the Yosemite installer volumes by ejecting them; you must eject “OS X Base System” before “OS X Install ESD”.
Re-configure the Finder to hide system files. Run these commands in the “Terminal” app:# Configure Finder to not show hidden system files.defaults write com.apple.finder AppleShowAllFiles FALSE# Close all Finder instances (and re-launch so settings take effect).killall Finder
Boot With USB Flash Drive
To boot a Mac with the USB flash drive:
*Insert the USB flash drive.
*While holding the “option/alt” key down, turn on the Mac to display the boot Startup Manager.
*You should see one or two icons, one for the internal hard drive and/or another called “OS X Base System” for the USB flash drive. (The internal hard drive may not be visible if it does not have a bootable partition installed.)
*Note: If you don’t see the USB flash drive’s “OS X Base System”, try removing and re-inserting the USB flash drive while viewing the Startup Manager screen. The USB flash drive should then appear after a few seconds.
*Select the “OS X Base System” and hit the “return/enter” key to boot from the USB flash drive.
Hopefully, this post will help you to create your own bootable USB flash drive installer for Mac OS X 10.10 Yosemite or Mac OS X 10.9 Mavericks.
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