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These advanced steps are primarily for system administrators and others who are familiar with the command line. You don’t need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.

*Mac Os X Boot Disk
*Make Os X Boot Usb
*Boot Mac Os Usb Hackintosh
*Download Mac Os X Yosemite Usb BootableDownload macOS
Find the appropriate download link in the upgrade instructions for each macOS version:
macOS Catalina, macOS Mojave, ormacOS High Sierra
Installers for each of these macOS versions download directly to your Applications folder as an app named Install macOS Catalina, Install macOS Mojave, or Install macOS High Sierra. If the installer opens after downloading, quit it without continuing installation. Important: To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.
Format the USB Drive to be Bootable: This is going to format the drive so that it will be a bootable. OS X 10.10, aka Yosemite, sports a more modern look and bridges the gap between Apple’s desktop and mobile devices. The new Continuity helps you hand off tasks from iPhone to iPad to Mac, but that.
8GB or ‘Greater’ USB ‘Install OS X Yosemite.zip’ file downloaded from Mac Store (Download from here) 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. Apple released the new Mac OS X 10.10 Yosemite in the Mac App Store for everyone to download and install for free on October 16th, 2014, but downloading a 5+ GB file for each of your computers will take some serious time. The best thing to do is download it once and create a bootable install USB drive from the file for all of your Macs.
OS X El Capitan
El Capitan downloads as a disk image. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.Use the ’createinstallmedia’ command in Terminal
*Connect the USB flash drive or other volume that you’re using for the bootable installer. Make sure that it has at least 12GB of available storage and is formatted as Mac OS Extended.
*Open Terminal, which is in the Utilities folder of your Applications folder.
*Type or paste one of the following commands in Terminal. These assume that the installer is still in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you’re using. If it has a different name, replace MyVolume in these commands with the name of your volume.
Catalina:*
Mojave:*

High Sierra:*
El Capitan:

*Press Return after typing the command.
*When prompted, type your administrator password and press Return again. Terminal doesn’t show any characters as you type your password.
*When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the bootable installer is created.
*When Terminal says that it’s done, the volume will have the same name as the installer you downloaded, such as Install macOS Catalina. You can now quit Terminal and eject the volume.
* If your Mac is using macOS Sierra or earlier, include the --applicationpath argument, similar to the way this argument is used in the command for El Capitan.Use the bootable installer
After creating the bootable installer, follow these steps to use it:
*Plug the bootable installer into a compatible Mac.
*Use Startup Manager or Startup Disk preferences to select the bootable installer as the startup disk, then start up from it. Your Mac will start up to macOS Recovery.
Learn about selecting a startup disk, including what to do if your Mac doesn’t start up from it.
*Choose your language, if prompted.
*A bootable installer doesn’t download macOS from the Internet, but it does require the Internet to get information specific to your Mac model, such as firmware updates. If you need to connect to a Wi-Fi network, use the Wi-Fi menu in the menu bar.
*Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.Learn more
For more information about the createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter this path in Terminal:
Catalina:
Mojave:
High Sierra:Mac Os X Boot Disk
El Capitan:
The all now OS X 10.10 Yosemite is out now and its a free upgrade like Mavericks. It’s very simple task to upgrade an exsisting os to Yosemite with “App Store”. It’s actualy one click away from Yosemite. But if you need to install a fresh copy of Yosemite into your macbook, you will need either a DVD installer or a Bootable Yosemite installer.Why a fresh installMake Os X Boot Usb
Many people says slow issues after upgrading to old version Mavericks. And after upgrading some of your already installed apps wont work. Keeping a USB installer drive is a good idea to use it for recovery or troubleshooting purposes. And if you have one bootable installer, you can use it with your other Macs to install the Yosemite. It really really helps you by avoiding downloading the Yosemite installer file in each Mac.What to backup
Before you start installing Yosemite, you should backup all the important data to an external resource. Installing the OS X is a kind of formatting your Mac. The process will wipe out the entire Hard disk. And more thing, you done need to backup or note a product key like windows product key in your mac. Mac doesn’t ask any product key while installing. Your Apple hardware is the product key for all your OS X installations.OS X Yosemite hardware requirements
You should check wether your current hardware is compatible with Yosemite. Minimum ram required for Yosemite is 2GB. But 4 GB or higher is recommended for best performance. A hard disk space of 40GB is recommended for installing Yosemite with ease. Please note your entire HDD will wipe out while installing the Yosemite.
*Macbook air late 2008 or later
*Macbook Pro mid 2007 or later
*Mac mini early 2009 or later
*iMac mid 2007 or later
*Mac Pro 9 early 2008 or later
Making a USB installer is an easiest task if you already downloaded the Yosemite installer “.App” file. For downloading the file you should go to the “App Store” and then select the “Updates” tab on the top right position. Click on the “free upgrade” option for downloading the Yosemite installer file. The app file size will be 5.16GB as i can see here. Now the installer file is downloading to the /Applications directory.
You need a 8GB or higher capacity USB pen drive which formatted as “Mac OS Extended (journaled)”Prevent auto deleting the downloaded file
After completing the download you should copy the downloaded file from /Applications directory to somewhere (i.e. to desktop). Because the downloaded file will automatically delete after starting the automatic upgrade process. Make sure you copied to a different directory. The downloaded file name and extension should look like Install OS X Yosemite.app. Now you are not far from create bootable usb of yosemite.Create bootable usb of yosemite
Now all set for create bootable usb of yosemite. Here in my case, i copied the Yosemite installer file “Install OS X Yosemite.app” to my “Desktop”. And my 16gb USB drive name is “Sandisk” and its plugged to my Mac. Now open the terminal and execute one command to make the stuff. Balsamiq 3.
NB: Make sure you give a different name for your USB drive than the your main HDD of your Mac.Boot Mac Os Usb Hackintosh
Execute the below command to create bootable usb of yosemite. Done forget to change the directory names with yours.
sudo /Users/Sreekanth/Desktop/Install OS X Yosemite.app/Contents/Resources/createinstallmedia –volume /Volumes/Sandisk –applicationpath /Users/Sreekanth/Desktop/Install OS X Yosemite.app –nointeraction
After 10 to 20 minutes your all new OS X Yosemite bootable USB installer will be ready.Download Mac Os X Yosemite Usb Bootable
For more about OS X Yosemite visit Apple
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