Create a Bootable USB Drive with Rufus & PowerISO – Free Tools

What You Need Before You Start

You need three things: a Windows or Linux ISO file downloaded from the official source, a USB pen drive of 8 GB or more (16 GB is comfortable, since a Windows 11 ISO is over 5 GB), and one of the two tools from the video. Rufus is a small portable program of a few megabytes from rufus.ie — it runs without installation. PowerISO is an installed program from poweriso.com. Download both only from their official sites, never from a random "free download" page.

Route One — Rufus, Step by Step

Rufus is free and open source, and it is the more precise of the two tools. Plug in the USB drive before opening Rufus, then confirm it in the Device dropdown — check the capacity matches your pen drive. Click SELECT and choose your ISO file. (No ISO yet? The small arrow beside SELECT offers a Download option that fetches official Windows ISOs from Microsoft's own servers.)

Leave Image option on Standard Windows installation for a normal installer USB. Set the Partition scheme for the PC you will install on: GPT for modern UEFI machines, MBR only for old BIOS-only machines — this is the setting that most decides whether the USB boots at all. Leave file system and cluster size on Rufus's chosen defaults, then click START and accept the erase warning. Wait for the green READY bar — do not pull the drive out early, because an interrupted write produces a USB that looks finished and fails mid-install.

Route Two — PowerISO, Step by Step

PowerISO is best known as an all-in-one disk image program — it creates, edits, converts, mounts and burns ISO, BIN, NRG and its own DAA files. Making a bootable USB is one of its tools, and it is deliberately simple: it asks far fewer questions than Rufus. Install PowerISO from the official site, poweriso.com, and start it as administrator — writing boot partitions needs elevated rights.

Open the Tools menu and choose Create Bootable USB Drive. Select your USB drive in the destination dropdown — again, check the capacity so you are not about to erase the wrong device. Select the ISO image file as the source, click Start and confirm the warning that all data on the drive will be destroyed. Wait for the completion message before removing the drive. Notice what is missing: no partition scheme choice, no file-system choice — PowerISO decides those itself. That is convenient for a simple job, and limiting when a particular PC refuses to boot, which is exactly where Rufus's controls earn their keep.

The Honest Difference Between the Two Tools

The video's title calls both of them free tools, and that needs one correction in plain words. Rufus is genuinely free — open source, no licence, no limits, no nag screens. PowerISO is shareware. Its unregistered trial shows a registration reminder when it starts and cannot create or edit image files larger than 300 MB; the maker states that all other functions, including the bootable USB writer, work the same. So the trial is enough to follow this guide — but if PowerISO stays on your PC, it is paid software and the honest thing is to register it. Prices change, so check the official site rather than trusting any number printed elsewhere.

Boot From the Finished USB

A burned USB does nothing until the PC is told to start from it. Restart the target PC and open its one-time boot menu — commonly F12, F9, Esc or F8, and the first startup screen usually names the key. Choose the entry beginning with UEFI: followed by your drive's name. If the screen says Press any key to boot from USB, press a key within a few seconds — otherwise the PC simply boots its old Windows and you will think the USB failed when it was never tried.

Test the USB Before You Actually Need It

Do not let the day of a repair or a fresh install be the first time this USB is ever booted. Boot it once — on the same PC or any spare machine — and confirm Windows Setup actually starts. A worn-out pen drive or an interrupted write can produce a USB that looks finished in Explorer and still fails halfway through an install, and finding that out during a test costs you two minutes instead of a broken afternoon.