Mac boot disk flash drive

Make sure the drive is empty and that there is only one partition. For a clean install of Mountain Lion on any compatible Mac, follow these steps:. For more on Mountain Lion, be sure to read the official Cult of Mac review. Cult of Mac.

How to boot a Mac from USB media

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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.

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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.


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  • How to quickly make a Mac OS X bootable USB on Windows;
  • 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. 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. 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.

    How to Make a Bootable Flash Installer of OS X or macOS

    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. Remember that this will wipe everything on your drive. Now download the version of macOS you want to use. Double-click this to get started.

    Boot from USB: Windows

    Click through the license agreement. Click Show All Disks and select your external drive. All the necessary files will copy over to your drive first, which might take up to 10 minutes. Then your Mac will shut down and the full installation will start. This takes a while, and the time estimate is not necessarily accurate.

    In our case the estimate was 15 minutes, but the process was still chugging away after half an hour. Faster hardware is definitely a plus here.

    How To Make A Bootable Disk Or USB Drive Of OS X Mountain Lion | Cult of Mac

    Now you just need to set it up as you normally would. Next time you start your computer, it might revert back to booting from your internal hard drive. Click the lock and enter your password to change the settings. Select your USB drive from the list and click Restart. The second method is to turn on your computer and hold down the Option key.

    How to create a bootable macOS Catalina installer on a USB drive

    Choose the external drive and hit Enter to continue booting. Both of these methods set the external drive as the default. Therefore you can simply unplug it whenever you want to boot to your internal drive instead. When running macOS off an external drive, you still have to shut it down in the normal way.

    How to create a bootable mac os x sierra usb flash drive