A 16GB or larger USB flash drive or a 16GB or larger partition on some other kind of external drive. A USB 3.0 drive will make things significantly faster, but an older USB 2.0 drive will work in. Sep 30, 2017 MacBook Pro, Mac OS X (10.7.5) Posted on Oct 30, 2013 7:01 PM Reply I have this question too ( 849 ) I have this question too Me too (849) Me too. You definitely want to use a USB 3.0 (or USB-C if you’re using a newer Mac) device, and even then, your system isn’t going to be nearly as snappy as your normal internal drive. So keep that in mind—you probably won’t want this to be your main macOS system. Mar 12, 2020 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.
by Jenefey AaronUpdated on 2020-01-10 / Update for OS X
You may need to boot up your Mac using an external drive or boot volume once in a while, rather than using a start up disk. Booting with an external disk has a lot of significance. Maybe you want to troubleshoot some problems, repair the disk, do partitions, format the entire disk, update, and install OS X etc. All these are executed perfectly when you use an external boot volume to boot up your Mac. In this article, we are here with the detailed step by step guide on how to boot Mac from external hard drive easily. So, let's get started…
Part 1: How to Boot Mac from USB Drive/CD/DVD
Actually, it is possible to boot Mac from external drive or a hard drive, but there are a few specific requirements needed for your Mac to become eligible for that process.
Boot from CD or DVD:
If you want to boot your MacBook/Air/Pro/iMac from an optical media like CD or DVD you need to follow the steps below:
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1. Open your Mac or restart the device if you were already using it.
2. When the startup music is playing press and hold the “C” key from the keyboard.
3. This will start the OS X installer from the CD/DVD on your Mac.
So, it is not too complicated to Mac boot from CD/DVD. You can easily burn a bootable image of OS X on a DVD by using Disk Utility.
Boot from External USB:
Using your USB drive to boot Mac is not as simple as you think. You need to prepare your USB drive beforehand for this specific purpose. You have to format the USB drive and insert the proper Operating System, which is OS X.
1. Turn on your Mac.
2. As soon as the startup music begins you need to press and keep holding the 'Option' key.
3. After that release that key, the Startup manager will be launched.
4. Startup Manager will begin scanning your device and you will be provided with a list of devices that are connected to your Mac.
5. Now, select the drive you want to use with your mouse.
6. Finally, press 'Return' key on the selected option to boot Mac.
This way you can boot your Mac with an external USB drive, but the most critical part is to prepare the USB drive. If you have multiple USB drives connected, then the Startup Manager shall list the drives with the bootable OS. So, this is how to boot Mac from USB drive.
Part 2: Common Problems and Fixes When Boot Mac from External Drive
You may face several issues during MacBook Pro Boot from USB or any external drive. So, a few FAQs are mentioned below which may help you when you are facing any difficulties.
So, this is how to startup Mac from external drive. Follow the frequently asked questions to clear any doubts that you have while booting from external hard drive Mac.
In case, you want to recover any lost or deleted Mac files after a boot, we highly recommend you to go for Tenorshare Any Data Recovery for Mac. It is a utility data recovery tool capable of recovering any type of data from Mac with ease. Go for it!
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