Why a flash drive? A bootable external or internal hard drive works well for desktop Macs but presents a cumbersome problem for notebook Macs. 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. Even if you don’t use a notebook, you may want to have a bootable USB flash drive on hand. What You Will Need. ![]() ![]() We’ve chosen to use a 16 GB or larger flash drive as a minimum for two reasons. Minecraft optifine mod for mac. First, a 16 GB flash drive is large enough to accommodate the current minimum amount of space required to install OS X directly from the install DVD, or macOS from a download from the Mac app store, or from the Recovery HD. 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 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. It’s possible to install a bootable copy of OS X on USB flash drives smaller than 8 GB, but it requires fiddling around with OS X’s individual components and packages, removing the packages you don’t need, and paring down some of OS X’s capabilities. For this article, we’re going to forego the extra steps and all that fiddling, and instead install a fully functional copy of OS X onto a USB flash drive. We recommend a 16 GB or larger flash drive because it’s big enough to install a complete copy of OS X, with room to spare for a few applications. Once you install Yosemite, the file will automatically erase itself, so it's important to make a bootable drive first. If you want to install first and then make a bootable drive, make a copy of the installer app in another location so you can access it later. Worst case scenario is downloading the large file again from the Mac App Store, but then why make a bootable drive? The Easiest Way: Use DiskMaker X By far the easiest way to create a bootable drive is to use the DiskMaker X application, which automates the entire process in the next method. To start out, download the newest version of DiskMaker X from. Currently, that's the. Upon completion of the USB formatting, locate Install Mac OS X Mountain Lion.app (downloaded in step #1 to the Applications folder, by default). Best bitcoin hardware wallet for mac. Right-click the file and select Show Package Contents. How to write a USB stick with macOS. (Update: the public Yosemite version is out now, and you can download it from,, or.) Once download, open it up and select 'Yosemite Beta' or 'Yosemite 10.10' (depending on the version you're using) to start the process. Then just follow the rest of the prompts to start the disk-making process. It could take anywhere from 15 minutes to to 45 minutes to finish, depending on your USB flash drive. If it's more toward the latter, you might get a ' error, but it should still work, (it worked for me). The Less Easy Way: Format & Use Terminal If you're more comfortable with Terminal commands, this is the method for you. Just make sure your USB drive is already formatted correctly before proceeding. To see how to correctly format your USB drive, please see Step #1 below in the 'The Hardest Way' section.
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