How to Install Windows 10 on USB

Creating a bootable Windows 10 USB drive is an invaluable skill for any tech enthusiast, system administrator, or even the average computer user. This portable operating system installation media offers unparalleled flexibility, allowing you to install Windows 10 on multiple machines, troubleshoot existing installations, or even run a fully functional Windows environment from a portable drive. Unlike traditional installation DVDs, USB drives are faster, more durable, and can be easily updated with new builds of Windows. This guide will walk you through the essential steps, from preparing your USB drive to successfully booting from it.

Table of Contents

Preparing Your USB Drive and Windows 10 Media

The first crucial step in creating a bootable Windows 10 USB drive is to ensure you have the correct prerequisites in place. This involves selecting an appropriate USB drive and obtaining the necessary Windows 10 installation files. The process is straightforward but requires attention to detail to avoid potential pitfalls.

Choosing the Right USB Drive

The capacity of your USB drive is paramount. Microsoft recommends a minimum of 8GB for a Windows 10 installation media. However, it’s always advisable to opt for a drive with a slightly larger capacity, such as 16GB or even 32GB. This provides ample space for the Windows 10 installation files, future updates, and any additional drivers or utilities you might want to include on the drive.

Beyond capacity, the speed of the USB drive significantly impacts the installation process. A USB 3.0 or newer drive will offer considerably faster read and write speeds compared to an older USB 2.0 drive. This translates to quicker file copying during the creation of the bootable media and, more importantly, a dramatically faster installation of Windows 10 onto the target computer. While a USB 2.0 drive will technically work, the time saved with a USB 3.0 or higher drive is often well worth the investment.

It’s also important to note that the process of creating a bootable USB drive will erase all existing data on the selected drive. Therefore, ensure that you back up any important files from the USB drive before proceeding.

Obtaining Windows 10 Installation Files

The most reliable and legitimate way to obtain Windows 10 installation files is directly from Microsoft’s official website. Microsoft provides a free tool called the “Media Creation Tool.” This tool allows you to download the latest version of Windows 10 directly from Microsoft’s servers and then create either an ISO file or a bootable USB drive.

Download the Media Creation Tool: Navigate to the official Microsoft Windows 10 download page. Look for the “Download tool now” button under the “Create Windows 10 installation media” section.
Run the Tool: Once downloaded, run the Media Creation Tool. Accept the license terms.
Choose “Create installation media (USB flash drive, DVD, or ISO file) for another PC.” This option is selected by default, but it’s good to confirm.
Select Language, Edition, and Architecture: The tool will typically suggest settings based on your current PC. You can uncheck “Use the recommended options for this PC” to customize these settings if you’re creating media for a different computer. For most users, selecting the appropriate language, the correct Windows 10 edition (e.g., Windows 10 Home, Windows 10 Pro), and the system architecture (64-bit is standard for modern computers) is crucial.
Choose “USB flash drive.” This is the option we need for creating a bootable USB.
Select Your USB Drive: The tool will list available USB drives. Select the one you prepared earlier. Double-check that you have selected the correct drive, as all data on it will be deleted.
Wait for the Process to Complete: The Media Creation Tool will now download the Windows 10 files and write them to your USB drive, making it bootable. This process can take a significant amount of time, depending on your internet speed and the speed of your USB drive.

Alternatively, if you already have a Windows 10 ISO file, you can use it to create a bootable USB. This is useful if you’ve downloaded the ISO previously or obtained it from a trusted source.

Creating the Bootable USB Drive Using Command Prompt

While the Media Creation Tool is the most user-friendly method, understanding how to create a bootable USB drive using the Command Prompt offers greater control and insight into the process. This method is particularly useful if the Media Creation Tool encounters issues or if you prefer a more manual approach. It requires more technical familiarity but is a powerful tool to have in your arsenal.

Utilizing Diskpart for a Manual Setup

The Windows built-in utility called diskpart is essential for this manual process. It allows you to manage disks, partitions, and volumes directly from the command line.

Connect Your USB Drive: Insert the USB drive into your computer. Ensure it has been formatted and has sufficient space.
Open Command Prompt as Administrator: Search for “cmd” in the Windows search bar, right-click on “Command Prompt,” and select “Run as administrator.”
Launch Diskpart: Type diskpart and press Enter. The prompt will change to DISKPART>.
List Disks: Type list disk and press Enter. This will display all connected storage devices. Carefully identify your USB drive by its size. It’s crucial to select the correct disk to avoid accidental data loss on your main hard drive.
Select Your USB Disk: Type select disk X (where X is the number corresponding to your USB drive from the list disk output) and press Enter.
Clean the Disk: Type clean and press Enter. This command will wipe all partitions and data from the selected disk, preparing it for a fresh format.
Create a Primary Partition: Type create partition primary and press Enter. This creates a new primary partition on the now-clean USB drive.
Select the Partition: Type select partition 1 and press Enter.
Format the Partition: Type format fs=ntfs quick and press Enter. fs=ntfs specifies the NTFS file system, which is recommended for Windows installations. quick performs a quick format, which is faster.
Mark the Partition as Active: Type active and press Enter. This makes the partition bootable.
Exit Diskpart: Type exit and press Enter to leave the diskpart utility.

Copying Windows 10 Files to the USB Drive

Once diskpart has prepared your USB drive, you need to copy the Windows 10 installation files onto it.

Mount the Windows 10 ISO (if applicable): If you have a Windows 10 ISO file, you need to mount it so its contents are accessible. In Windows 8 and later, you can usually double-click an ISO file to mount it as a virtual drive. Alternatively, you can use third-party tools like 7-Zip or WinRAR to extract the ISO contents.
Copy Files: Open another Command Prompt window as administrator.
- Identify the drive letter of your mounted ISO (e.g., D:).
- Identify the drive letter of your prepared USB drive (e.g., E:).
- Use the xcopy command to copy all files from the ISO to the USB drive. A common command would look like: xcopy D:*.* E: /s /e /f
  - D:*.*: Specifies all files and folders on the source drive (your mounted ISO).
  - E:: Specifies the destination drive (your USB drive).
  - /s: Copies directories and subdirectories, unless they are empty.
  - /e: Copies directories and subdirectories, including empty ones.
  - /f: Displays full source and destination filenames while copying.
Wait for Completion: This file copy process can take a considerable amount of time, especially with a large ISO file and a slower USB drive.

For Windows 10 installations on UEFI systems, it’s important to format the USB drive as FAT32. If your USB drive is larger than 32GB, diskpart might default to NTFS. In such cases, you may need to use a different formatting tool to ensure FAT32 compatibility, or if using diskpart, you can specify format fs=fat32 quick. However, FAT32 has a 4GB file size limit, which can be problematic for larger Windows 10 installation files (specifically the install.wim or install.esd). If you encounter this issue, you might need to split the install.wim file using the DISM command or consider using NTFS if your target system supports booting from NTFS on UEFI.

Booting from the USB Drive and Installing Windows 10

Once your bootable Windows 10 USB drive is ready, the next step is to configure your computer to boot from it and initiate the installation process. This involves accessing your computer’s BIOS/UEFI settings.

Accessing BIOS/UEFI Settings

The BIOS (Basic Input/Output System) or UEFI (Unified Extensible Firmware Interface) is firmware that initializes your hardware when you power on your computer and loads the operating system. Accessing these settings allows you to change the boot order.

Insert the USB Drive: Ensure the bootable Windows 10 USB drive is plugged into the target computer.
Restart or Power On the Computer: Turn on or restart the computer.
Press the BIOS/UEFI Key: Immediately after the computer powers on, you will need to press a specific key to enter the BIOS/UEFI setup. This key varies depending on your computer’s manufacturer and model. Common keys include:
- Delete (Del)
- F2
- F10
- F12
- Esc
- Often, the correct key is displayed on the screen briefly during the initial startup sequence (e.g., “Press DEL to enter Setup”). If you miss it, restart and try again.
Navigate to Boot Settings: Once in the BIOS/UEFI menu, navigate through the options to find the “Boot,” “Boot Order,” or “Boot Priority” settings. This is usually found under sections like “Advanced BIOS Features” or “System Configuration.”
Change the Boot Order: In the boot settings, you will see a list of bootable devices. Use the arrow keys (and potentially other specified keys like + or -) to move your USB drive (it might be listed by its brand name or as “USB HDD,” “Removable Device,” etc.) to the top of the boot order.
Save and Exit: After setting the USB drive as the first boot device, navigate to the “Save and Exit” section of the BIOS/UEFI menu. Select “Save Changes and Exit” or a similar option. The computer will restart.

The Windows 10 Installation Process

If you’ve correctly set the boot order, the computer will now boot from your USB drive, and you’ll be greeted by the Windows 10 setup wizard.

Windows Setup Starts: You’ll see the Windows logo, and then the Windows Setup screen will appear.
Language, Time, and Keyboard Settings: Select your preferred language, time and currency format, and keyboard or input method. Click “Next.”
Install Now: Click the “Install now” button.
Product Key (Optional): If you have a Windows 10 product key, enter it now. If you are reinstalling Windows on a computer that has already been activated with a digital license, you can click “I don’t have a product key” and Windows will automatically activate later.
Select Operating System Version: If your USB media contains multiple editions of Windows 10 (e.g., Home and Pro), select the version you want to install.
Accept License Terms: Read and accept the license terms, then click “Next.”
Choose Installation Type:
- Upgrade: This option installs Windows 10 and keeps files, settings, and applications. This is only available if you are running a compatible version of Windows and are upgrading from within Windows.
- Custom: Install Windows only (advanced): This option is for a clean installation. It allows you to partition your hard drive, format existing partitions, and install Windows from scratch. This is the recommended option for a fresh installation and for installing Windows to a new drive.
Drive Selection (Custom Install): If you chose “Custom,” you’ll see a list of drives and partitions on your computer.
- New Installation: Select the drive where you want to install Windows. If it’s a new, unallocated drive, click “New” to create partitions. Windows will automatically create necessary system partitions.
- Reinstallation: You can select an existing partition, format it, and then proceed with the installation. Be extremely careful here, as formatting will erase all data on that partition.
- Click “Next” after selecting or preparing the partition.
Installation Progress: Windows will now begin installing. This process involves copying files, installing features, installing updates, and completing the setup. The computer will restart several times during this phase. Crucially, do not remove the USB drive until Windows has completed its initial setup and you see the “Get started quickly” or personalization screen. If you remove it too early, the installation might fail.
Initial Setup and Configuration: After the main installation, Windows will guide you through the Out-of-Box Experience (OOBE). This includes setting up your region, keyboard layout, connecting to a network, creating a user account (either a local account or a Microsoft account), setting up a PIN or password, configuring privacy settings, and more.

By following these steps meticulously, you will have successfully created a bootable Windows 10 USB drive and installed the operating system on your computer. This portable installation media is a testament to the flexibility and accessibility of modern operating systems and the tools available to manage them.