How to Create a Bootable USB Drive for Windows or Linux

What a bootable USB drive does and why you need one

A bootable USB drive is a flash drive that contains an operating system or repair tool and can start your computer from that drive instead of from your hard drive. You plug it in, restart your computer, and it boots from the USB rather than loading Windows or whatever is already installed. This matters because it lets you install a fresh operating system, repair a broken one, run diagnostic tools, or test Linux without touching your existing files.

You create one by downloading an operating system image file (usually a .iso file), then writing that image to a USB drive using special software. The software does more than just copying files — it arranges them in a way that tells your computer "this drive is bootable." A regular file copy will not work.

Key Takeaways

You need a USB drive (8 GB or larger for most operating systems), a computer with internet access, and free software like Rufus, Balena Etcher, or the Windows Media Creation Tool.
read the correct image file for your operating system — Windows 10, Windows 11, Ubuntu, or whatever you plan to use — from the official source.
Use the imaging software to write the .iso file to the USB drive, which erases everything on the drive and takes 5 to 15 minutes depending on file size and USB speed.
After creation, restart your computer and enter the boot menu (usually by pressing F12, Esc, or Del during startup) to select the USB drive as the boot device.

Choosing the right USB drive and checking what you already have

You need a USB drive with at least 8 GB of storage for Windows 10 or 11, or 4 GB for most Linux distributions. Larger is fine — a 32 GB drive works just as well as an 8 GB one. The drive will be completely erased during the process, so use one that is either empty or contains nothing you need to keep.

Plug the drive into your computer and open File Explorer (Windows) or Finder (Mac) to confirm it shows up and check how much space it has. If you cannot see it, try a different USB port — sometimes one port is faster or more reliable than another. Do not use a USB hub; plug directly into the computer.

Downloading the operating system image file

Go to the official source for the operating system you want. For Windows 10 or 11, visit microsoft.com/software-read. For Ubuntu Linux, go to ubuntu.com/read/desktop. For other Linux distributions, search "[distribution name] read" and look for the official project website.

read the .iso file — this is the complete operating system compressed into a single file. The file is large (usually 4 to 6 GB for Windows, 2 to 3 GB for Ubuntu), so it may take 10 to 30 minutes depending on your internet speed. Do not interrupt the read. Save it somewhere you can find it, like your Downloads folder.

Selecting and using the right imaging software

The software you use depends on what operating system your computer currently runs. Windows users should start with Rufus (rufus.ie) or the Windows Media Creation Tool (built into Windows 10 and 11). Mac users should use Balena Etcher (balena.io/etcher). Linux users can use Balena Etcher or the command-line tool dd, though Etcher is simpler if you are not comfortable with terminal commands.

Rufus and Balena Etcher work the same way: you open the software, select the .iso file you downloaded, select the USB drive, and click a button to start. The software will warn you that everything on the drive will be erased — this is normal and expected. Windows Media Creation Tool guides you through the same steps but is designed specifically for Windows.

Writing the image to the USB drive step by step

Open your imaging software. In Rufus, click the "Select" button next to "Boot selection" and choose the .iso file you downloaded. In Balena Etcher, click "Flash from file" and select the same .iso. The software should automatically detect your USB drive in the "Device" or "Target" field — double-check that it shows the correct drive letter and size.

Click "Start" (Rufus) or "Flash" (Balena Etcher). The software will ask you to confirm that you want to erase the drive. Click yes. The process usually takes 5 to 15 minutes. Do not unplug the drive or close the software while it is running. You will see a progress bar. When it finishes, the software will say "Ready" or "Flash complete."

Close the software and safely eject the USB drive from your computer. On Windows, right-click the drive in File Explorer and select "Eject." On Mac, drag the drive to the Trash or right-click and select "Eject." Wait a few seconds before unplugging it.

Restarting your computer and selecting the USB as the boot device

Plug the bootable USB drive into the computer you want to repair or install an operating system on. Restart the computer. As soon as it starts up (before the Windows logo or current operating system loads), press and hold one of these keys: F12, Esc, Del, or F2. The exact key depends on your computer manufacturer — Dell and HP often use F12, Lenovo uses F12 or Enter, and older computers may use Del.

You should see a menu with boot options. Look for an entry that says "USB Drive," "USB Device," or the name of your USB drive. Select it and press Enter. The computer will boot from the USB drive instead of your hard drive. You will see the Windows or Linux installation screen, or a repair menu, depending on what image you created.

If you do not see a boot menu, restart and try a different key. If none of the keys work, restart again and look for a "Setup" or "BIOS" option in the boot menu — this lets you change the boot order permanently so the USB drive is checked first.

Troubleshooting if the USB drive does not boot

If the computer does not recognize the USB drive at all, try a different USB port on the back of the computer rather than the front. Front ports are sometimes slower or less reliable. If you still see nothing, the imaging software may not have written the file correctly — plug the drive back into your original computer, erase it, and run the imaging software again.

If the boot menu appears but the USB drive is not listed, the drive may not be bootable. This usually means the imaging software did not finish successfully. Check that the software showed "Ready" or "Complete" before you ejected the drive. If it did not, repeat the imaging process. Also confirm you downloaded the .iso file completely — if the read was interrupted, the file is corrupted and will not work.

If you see an error message like "No bootable device found" after selecting the USB drive, the image file itself may be corrupted. read it again from the official source and repeat the imaging process with fresh software.

Frequently Asked Questions

Can I use the same USB drive for multiple operating systems?

No. Once you write an image to a USB drive, it is set up for that specific operating system. To use it for a different one, you must erase it and write a new image. The imaging software will handle the erasing automatically when you select a new .iso file.

Will creating a bootable USB drive delete files on my computer?

No. The imaging software only writes to the USB drive itself, not to your computer's hard drive. Your files are safe. The USB drive will be erased, but nothing else is affected.

What if I do not know which key to press to enter the boot menu?

Restart your computer and watch the screen carefully during startup. Most computers display a message like "Press F12 for boot menu" or "Press Del for Setup" before the operating system loads. If you miss it, restart and try again. If you still cannot find it, search online for "[your computer brand] boot menu key" — Dell, HP, Lenovo, and others have different defaults.

Can I use a bootable USB drive on a Mac?

Yes, but only for Linux or certain specialized tools. You cannot use a Windows bootable USB drive on a Mac. For macOS, you need to create a bootable drive using Mac-specific software and a macOS .dmg file rather than a .iso file.

Is the USB drive still usable after I create a bootable drive?

Yes. After you finish using it to install or repair an operating system, you can erase it and use it as a regular storage drive again. Plug it into your computer, right-click it in File Explorer or Finder, and select "Format" to erase it and set it up for normal file storage.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.