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And you just need to follow its on-screen instructions to create a bootable USB drive by clicking a few buttons. Before using createinstallmedia command, people used to use Disk Utility to create a bootable installer drive manually.

How to Repair a Mac Boot Disk with Disk Utility in Mac OS X

But the process is much more complicated than the Terminal method. So Apple also suggests you make a bootable install drive via Terminal.


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Mount the Mac OS installer to get. Files from InstallESD. Leave your comment below. FonePaw uses cookies to ensure you get the best experience on our website. Click Privacy Policy to learn more. Got it! Newsletter Subscribe. A flash drive is a simple, inexpensive, and portable emergency boot device that can handle OS X or the macOS. Heck, it can even have both operating systems installed, letting you use the emergency USB flash drive to boot any of the Mac's you may have.

Part 2: How to Burn DMG to USB (Bootable) via DMG Editor on Mac

Eliminating the need to pare down the OS to get it to fit on the USB flash drive significantly simplifies the installation process. Second, the cost of USB flash drives is falling. A 16 GB USB flash drive is large enough to install both a complete copy of the macOS and some of your favorite applications or recovery utilities, making it a budget-friendly emergency device that can boot your Mac and possibly repair or recover its data and get it running again. Selecting a USB flash drive to use for creating a bootable OS X or macOS device is actually relatively straightforward, but here are some concerns to consider and a few suggestions to make the selection process easier.

This is also true of macOS, the later versions of the Mac operating system.

How to Create a Mac OS X USB Boot Drive in Recovery Mode

Speed is a mixed bag for USB flash drives. Focus on read speeds rather than write speeds when you shop for a USB flash drive. Apple is the primary source for this type of adapter, but as USB-C gains popularity, you will be able to find third party suppliers at reasonable prices for the adapters. Most USB flash drives are formatted for use with Windows.

How to Make a Bootable MacOS Mojave Installer Drive

The process for formatting your flash drive is very similar to what is outlined above. We prepared the USB flash drive by partitioning and formatting it and then enabling ownership. The flash drive will now appear to the OS X installer as just another hard drive that is ready for installation of OS X.

Having said that, we recommend that you customize the software packages that OS X will install. Before you begin the installation, a few notes about the process. As we mentioned earlier, USB flash drives are much slower at writing data.

How to choose a startup disk on your Mac to boot from USB – NinjaStik

When we performed the installation, it took about two hours. You can expect to see plenty of beach balls and slow responses as you work your way through the installation process. If speed is a big issue for you, you can entertain the idea of purchasing a small SSD in a portable enclosure. Some manufacturers are making SSDs that are just slightly larger than the standard flash drive. Of course, you will pay a premium for the speed.


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A bootable USB flash drive will help you get your Mac back to working condition, by letting you use all of the tools a fully-working Mac has available. In addition to being able to use Disk Utility, the Finder, and Terminal, and have access to the Internet, you can also load some specific emergency tools onto your USB flash drive. Here are some of the utilities we suggest installing. Share Pin Email.