How To Use Rufus To Create A Bootable USB (Full Guide)

A bootable USB stick is one of the most useful tools a PC owner can have. It installs Windows when your PC will not boot, tries out Linux without touching your hard drive, and rescues systems when everything else fails. Rufus is the small, free program most people use to make one — and while it looks simple, a couple of choices in its window (partition scheme, target system) decide whether the stick actually boots on your machine. This step-by-step guide gets them right.

Table of Contents

Quick Answer

To create a bootable USB with Rufus: insert a USB stick of at least 8 GB, open Rufus, select your stick under Device, click SELECT and choose your ISO file (for example a Windows or Linux installer), set Partition scheme to GPT for modern PCs (UEFI) or MBR for old BIOS machines, then click START and wait about 5–15 minutes. Warning: everything on the USB stick is erased in the process, so back up its contents first.

What You Need

A USB stick, 8 GB minimum (16 GB is more comfortable for Windows ISOs), with nothing important on it.
The ISO file you want to boot — for example the Windows installer from Microsoft’s official Windows download page, or a Linux distribution’s ISO from its official site.
Rufus itself, downloaded from the official Rufus website. It is free, tiny, and runs without installation (choose the portable version and it is just one file).
Ten quiet minutes — and the PC you plan to boot should be one you are allowed to reinstall or test.

Step by Step: Creating the Bootable USB

Insert the USB stick and note its drive letter in File Explorer. Triple-check you know which stick it is — Rufus will erase it completely.
Open Rufus. Under Device, select your USB stick. If several storage devices are listed and yours is missing, tick “List USB Hard Drives” in the advanced options — carefully.
Choose the ISO. Leave Boot selection on “Disk or ISO image,” click SELECT, and browse to your ISO file. Rufus reads it and fills in sensible defaults automatically.
Set the partition scheme. This is the decision that matters most:
- GPT + UEFI — for any reasonably modern PC (roughly 2013 onwards) and for Windows 11. Target system shows UEFI (non CSM).
- MBR + BIOS or UEFI — for very old machines that only have a legacy BIOS. When in doubt about an old PC, MBR is the safer fallback.
Leave the rest at defaults for a first attempt: file system and cluster size are chosen by Rufus based on the ISO, and the volume label can be anything you like.
Click START. For Windows ISOs, Rufus offers helpful extras in a customization dialog — such as bypassing the Microsoft account requirement during setup or creating a local account. Choose what you genuinely need, or leave everything unticked for a standard installer.
Confirm the warning that all data on the stick will be destroyed, then wait. The progress bar usually takes 5–15 minutes depending on the stick’s speed. When it says READY in green, you are done — close Rufus and eject the stick.

How to Boot From Your New USB Stick

Insert the stick into the target PC while it is off.
Power on and immediately tap the boot menu key repeatedly — commonly F12, F8, F11, Esc, or F2, depending on the brand. The first screen often flashes which key it is.
Choose the USB entry from the boot menu. On UEFI systems you may see it listed as “UEFI: [stick name]” — pick that one for a GPT stick.
The installer or live system loads. For Windows setup, follow the prompts; for most Linux ISOs, you can choose “Try” to run without installing.
If the stick is ignored or the PC boots Windows as usual, Secure Boot may be blocking a non-Microsoft system, or the partition scheme does not match the firmware — remake the stick with the other scheme before changing BIOS settings blindly.

A bootable stick is also the setup tool you will want when test-driving a system in software first — for example before committing to the setups in our guide to the best free virtual machine software for running Linux on Windows.

Common Mistakes to Avoid

Selecting the wrong device. Rufus will erase whatever is in the Device box. Remove other USB drives before you start, and read the capacity shown.
Choosing GPT for an ancient BIOS-only PC (or MBR for a strict UEFI-only new machine) — the stick simply will not appear or will fail to boot. Match the scheme to the machine.
Copying the ISO onto the stick as a file with Explorer and expecting it to boot. Bootable means the stick’s structure itself is rebuilt by a tool like Rufus — a plain file copy never boots.
Interrupting the write because it seems stuck at a percentage. Some stages sit still for a minute; wait for the READY message or an error.
Using a failing old stick. Cheap worn-out USB drives corrupt writes silently. If installs keep failing at random points, suspect the stick and test with another.

Troubleshooting: The Stick Will Not Boot

When a freshly made stick refuses to start the PC, work through this checklist in order — one of these fixes the problem nearly every time:

Wrong boot entry chosen. Re-open the boot menu and look carefully: a GPT stick on a UEFI machine may appear twice, once plain and once prefixed “UEFI:”. Choose the UEFI one. A stick not listed at all suggests the port, the stick, or the write itself.
Try a different USB port. Use a port directly on the machine (ideally a rear port on a desktop), not a hub or front-panel port with a flaky cable. Some older systems will not boot from USB 3 ports.
Partition scheme mismatch. The classic. If you made GPT and the machine is BIOS-only (or the reverse), the stick is invisible to the firmware. Remake it with the other scheme — five minutes in Rufus beats an hour in BIOS menus.
Secure Boot blocking Linux. Mainstream distributions ship signed bootloaders and work with Secure Boot on. If yours does not and the firmware offers the switch, disabling Secure Boot temporarily is a legitimate step on your own machine — note the setting so you can restore it afterwards. Windows ISOs never need this.
The ISO itself is damaged. A truncated download writes successfully but fails mid-boot or mid-install. Re-download the ISO — Rufus can verify checksums (the ✓ button beside SELECT) against the publisher’s published hash if you want certainty.
The stick is dying. Repeated write errors, sticks that vanish mid-write, or different failures every attempt point at the hardware. Retire it and use another stick; this is the same lesson as testing any aging drive’s health before trusting it.

Keep notes on what worked for your machine — boot key, scheme, any setting changed — on a label on the stick itself. Rescue tools earn their keep at stressful moments, and a labelled stick with the answers written on it is the difference between a ten-minute recovery and a bad evening.

Conclusion

Rufus turns any spare USB stick into an installer, a rescue disk, or a Linux test drive in about ten minutes. Remember the three essentials: back up the stick first because it will be wiped, pick GPT for modern UEFI PCs and MBR for old BIOS machines, and download both Rufus and your ISOs only from official sources. Keep the finished stick in a labelled drawer — future-you, staring at a PC that will not boot, will be extremely grateful.

Frequently Asked Questions

Is Rufus free and safe?

Yes. Rufus is free, open-source, and one of the most trusted utilities of its kind. Download it only from rufus.ie — fake lookalike sites bundle unwanted software.

Will using Rufus erase my USB stick?

Completely. Creating a bootable USB reformats the stick and overwrites its contents, so copy anything you need elsewhere first. Afterwards you can reformat the stick back to normal storage whenever you like.

What size USB stick do I need?

8 GB covers current Windows and most Linux ISOs. Choose 16 GB to be comfortable, especially for Windows ISOs, which are growing with each release.

What is the difference between GPT and MBR in Rufus?

They are partition layouts matched to the PC’s firmware. GPT pairs with modern UEFI firmware (and is required thinking for Windows 11-era machines); MBR pairs with the legacy BIOS found on very old PCs. The stick must match the machine, or it will not boot.

Can I use the same stick to install on many PCs?

Yes. A Windows installer stick can install on any compatible PC (each needs its own licence to activate). A Linux stick can boot or install on as many machines as you like.