How to Set Your Computer to Boot from USB Flash Drive

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A bootable USB flash drive is useful for installing an operating system or diagnosing system problems. But once you have your bootable USB flash drive, how can you boot from it? This wikiHow teaches you how to start up your Windows PC or Mac from a USB flash drive.

Method 1
Method 1 of 2:

Windows

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    As long as your USB drive is bootable , it'll be easy to boot from it when restarting your PC.
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    You can do this by clicking the Start menu and selecting Settings or the gear icon.
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    It's the two curved arrows at the end of the list.
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    It's in the left panel.
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    This is in the right panel.
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    It's the icon with a screwdriver and a wrench.
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    It's the option with a computer chip and a gear.
    • If you don't have this option, you will need to restart your computer and get to the BIOS using your hardware's default key. As soon as you see the logo, you will need to hit either F1, F2, F6, F10, or Del to enter the BIOS menu—the key you need to press should appear quickly on the screen (look for "Press X to enter setup").
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    Your PC will now reboot into the BIOS/UEFI, which is where you'll tell your PC you want to boot from your USB flash drive.
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    Every manufacturer has a different BIOS/UEFI setup, so you may have to browse around to find a menu called Boot, Boot Order, or Boot Options. You'll know you're in the right place once you see a list of different types of drives (such as optical drive, removable drive, USB drive, etc.).
    • If you're using a Lenovo PC, for example, you'll select the Boot tab at the top.
    • You may have to select a menu called Advanced , Storage , or System Configuration to find the Boot or Boot order menu.
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    This area is going to look different depending on the manufacturer. Your goal is to make the device that's called something like "USB drive" or "Removable Drive" the first item in the boot order.
    • If you don't see an option to change the order of the drives, you may just need to switch on a setting that enables "USB Boot" or similar.
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    You can usually do this by selecting a tab or option called Save & Exit , or by pressing F10 . Once you confirm and exit, your PC will reboot from the USB drive.
    • Be sure to remove the flash drive when you're done using it. Otherwise your PC will try to boot from it the next time you have to reboot.
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Method 2
Method 2 of 2:

macOS

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    As long as your USB drive is bootable , it'll be easy to boot from it when restarting your Mac.
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    The process to boot from a USB drive is different depending on the type of processor inside of your Mac. To find out:
    • Click the Apple menu at the upper-left corner and select About This Mac . [1]
    • If you see "Chip" followed by a name like "Apple M1" (or similar), you have an Apple Silicon chip.
    • If you see "Processor" followed by a name that starts with "Intel," you have an Intel processor.
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    If your Mac is on now, click the Apple menu and select Shut Down .
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    The process is different depending on your processor:
    • Apple Silicone: Press and hold the Power button until you see "Loading startup options." At that point, let go of the button. [2]
    • Intel: Press and hold the Option key as you restart your Mac. Keep holding down the Option key until you see a list of available startup disks.
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    Your Mac will now boot from the USB drive.
    • This won't permanently change the boot order. The next time you start up your Mac, it'll start from your regular hard drive as normal.
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  • Question
    Can I use and boot from an existing O/S (XP) hard drive in a USB enclosure with Windows 10?
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    Yes, as long as there is enough available storage to support Windows 10.
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  • Question
    How can I tell if my computer booted from the flash drive, if the hard drive is second priority?
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    The windows installation screen should appear when you are planning on installing a new Windows.
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    What can cause my computer to display multiple colors after installing Windows 7?
    Community Answer
    If you're booting from a copy of Windows 7 on a USB drive, the most likely culprits are a corrupted copy of Windows, which just requires a reinstall, or damage done to the USB, which may be present on either the drive or the computer's port itself. Or the monitor may just be having some issues of its own. If you get these colors when doing hardware intensive tasks like gaming, exporting video files or any other GPU-intensive tasks, the driver may be crashing which can be caused system errors or by overheating of the card.
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      References

      1. ↑ https://support.apple.com/en-us/HT211814
      2. ↑ https://support.apple.com/guide/mac-help/change-your-mac-startup-disk-mchlp1034/mac

      About This Article

      Article Summary X

      1. Insert a bootable USB flash drive.
      2. Go to Settings > Update & Security > Recovery > Restart Now .
      3. Click Troubleshoot and select UEFI Firmware Settings .
      4. Click Restart .
      5. Open the Boot or Boot Order menu.
      6. Make USB or Removable Drive the first option in the boot order.
      7. Save and exit.

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