Mac Os X Start From Usb Drive
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- Using A Bootable USB Drive. Once it complete you can using your USB drive to boot into recovery mode. Restart (or start) your Mac and hold down the option key. This will allow you to pick the USB drive to boot into. Once booted you can use the options to restore from a Time Machine backup, use Disk Utility to repair your hard drive, reinstall.
- Sep 14, 2015 Requirements Step 1: Turn on your Mac by pressing the power button, or restart it if it’s already on by choosing Restart in the Apple. Step 2: Press and hold the C key on your keyboard immediately upon hearing the startup chime. Your Mac should start up.
When you Mac doesn’t boot it can be the end of the world. Hard drives are fragile and when they fail it can stop your from starting your Mac and booting. Although your Mac has a built in recovery partition it is always worth having a USB version to boot into in case your hard disk drive is toast. Creating a bootable USB drive allows you to repair your hard drive, reinstall the OS and restore from a Time Machine backup.
Create A Bootable USB Drive
The first step is to find yourself a USB flash drive. You only need a drive 1GB in size. If you have a bigger one the space will be wasted unless you play around with partitioning the drive.
The next step is to download the recovery assistant from Apple. This is a free app that we will be using. Install the app into your apps folder (I recommend the Utilities folder). Open the app and plug in your USB drive. Select it within the app. Note that you need to have FileVault disabled for this to work.
When you hit OK the app will copy across the various bits and bytes it requires to create the bootable drive. This doesn’t take too long to complete.
Jan 09, 2020 Failure to eject a USB drive before pulling it out of the port can cause the OS to view the port’s status incorrectly and may impact its ability to be identified and accessed. 4 Update Your Mac’s OS and Firmware. Checking for updates may be one of the easiest ways to open USB ports on your Mac.
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The blocks are being copied across to create the drive.
Mac Os X Start From A Usb Drive
Once it is complete your have a bootable drive.
Using A Bootable USB Drive
Once it complete you can using your USB drive to boot into recovery mode. Restart (or start) your Mac and hold down the option key. This will allow you to pick the USB drive to boot into.
Once booted you can use the options to restore from a Time Machine backup, use Disk Utility to repair your hard drive, reinstall the OS, and get help online. It is the standard boot page which can be accessible from holding Command + R on your Mac. Normally you can boot into this drive if you hard drive is working normally.
Get Your USB Drive Back
You will notice that when you plug your bootable USB drive into your Mac that it will not appear in Finder. If you want to get back your USB drive open Disk Utilities in your Application > Utilities folder.
Select the drive from the sidebar. Use the Erase option to erase the drive, this will delete all of the data and get your USB drive as a normal drive.
Erase the USB drive in disk utility to get it back as a normal drive.
Conclusion
It is a simple method to create a USB bootable drive. It is worth making one, sticking a label on it and put it in your draw. You never know when you need to boot into your Mac and you can’t access your hard drive.
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Where To Next?
To use any of these key combinations, press and hold the keys immediately after pressing the power button to turn on your Mac, or after your Mac begins to restart. Keep holding until the described behavior occurs.
- Command (⌘)-R: Start up from the built-in macOS Recovery system. Or use Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the Internet. macOS Recovery installs different versions of macOS, depending on the key combination you use while starting up. If your Mac is using a firmware password, you're prompted to enter the password.
- Option (⌥) or Alt: Start up to Startup Manager, which allows you to choose other available startup disks or volumes. If your Mac is using a firmware password, you're prompted to enter the password.
- Option-Command-P-R:Reset NVRAM or PRAM. If your Mac is using a firmware password, it ignores this key combination or starts up from macOS Recovery.
- Shift (⇧): Start up in safe mode. Disabled when using a firmware password.
- D: Start up to the Apple Diagnostics utility. Or use Option-Dto start up to this utility over the Internet. Disabled when using a firmware password.
- N: Start up from a NetBoot server, if your Mac supports network startup volumes. To use the default boot image on the server, hold down Option-N instead. Disabled when using a firmware password.
- Command-S: Start up in single-user mode. Disabled in macOS Mojave or later, or when using a firmware password.
- T: Start up in target disk mode. Disabled when using a firmware password.
- Command-V: Start up in verbose mode. Disabled when using a firmware password.
- Eject (⏏) or F12 or mouse button or trackpad button: Eject removable media, such as an optical disc. Disabled when using a firmware password.
If a key combination doesn't work
If a key combination doesn't work at startup, one of these these solutions might help:
- Be sure to press and hold all keys in the combination together, not one at a time.
- Shut down your Mac. Then press the power button to turn on your Mac. Then press and hold the keys as your Mac starts up.
- Wait a few seconds before pressing the keys, to give your Mac more time to recognize the keyboard as it starts up. Some keyboards have a light that flashes briefly at startup, indicating that the keyboard is recognized and ready for use.
- If you're using a wireless keyboard, plug it into your Mac, if possible. Or use your built-in keyboard or a wired keyboard. If you're using a keyboard made for a PC, such as a keyboard with a Windows logo, try a keyboard made for Mac.
- If you're using Boot Camp to start up from Microsoft Windows, set Startup Disk preferences to start up from macOS instead. Then shut down or restart and try again.
Remember that some key combinations are disabled when your Mac is using a firmware password.
Learn more
Mac Os X Boot From Usb Drive
- Learn what to do if your Mac doesn't turn on.
- Learn about Mac keyboard shortcuts that you can use after your Mac has started up.