9/26/2019 Mac Usb Boot
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. Insert the USB flash drive into your Mac’s USB port. Launch Disk Utility, located at /Applications/Utilities/.
Boot your Mac from CD, DVD, external drive, or USB flash – At some point, you may find a need to boot your Mac from a disc or a drive other than the primary Mac OS X startup volume. Apple made it easy so all you need to know. How can the answer be improved?
In the list of drives attached to your Mac, select the USB flash drive device. In our case, it’s called 14.9 GB SanDisk Cruzer Media. (Like lumber, hard drives and flash drives are actually slightly smaller than their specs would have you believe.). Click the Partition tab. Select 1 Partition from the Volume Scheme drop-down menu.
Enter a descriptive name for your flash drive; we chose Boot Tools. Select Mac OS X Extended (Journaled) from the Format drop-down menu. Click the Options button. Select GUID Partition Table from the list of available partition schemes. Click the Apply button. A sheet will drop down, warning you that you are about to erase all data from the disk.
Click Partition. Disk Utility will format and partition your flash drive. Quit Disk Utility. Before you begin the installation, a few notes about the process.
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As we mentioned earlier, USB flash drives are much slower at writing data. Since the installation process is all about writing data to the USB flash drive, it’s going to take quite some time.
When we performed the installation, it took about two hours. So be patient, and don’t worry about how slow some of the processes seem; this is normal.
You can expect to see plenty of beach balls and slow responses as you work your way through the installation process.
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