Transfer a Windows 8 ISO to a bootable USB flash drive

Greg Shultz shows you how to transfer a Windows 8 ISO to a bootable USB flash drive.

In last week's post, Get the free 90-day evaluation of Windows 8 Enterprise, I showed you how to download the free 90-day evaluation copy of the final version of Windows 8 Enterprise and burn the ISO file to a bootable DVD using Windows 7's Windows Disc Image Burner tool. While installing from a DVD is suitable in most situations, you may want to be able to install Windows 8 from a USB flash drive. Fortunately, doing so is not as difficult as it once was. In fact, Microsoft has a utility called the Windows 7 USB/DVD Download Tool that will allow you to convert the ISO image so that it can boot from a USB flash drive. (Keep in mind that while the tool has Windows 7 in its name, it will still work for Windows 8.)

In this article, I'll show you how to download, install and use the Windows 7 USB/DVD Download Tool to transfer the Windows 8 Enterprise evaluation ISO to a bootable USB flash drive. Keep in mind that while I'll use the Windows 8 Enterprise evaluation ISO as my example, this procedure will work with any Windows 7 or Windows 8 ISO.

This blog post is also available as a TechRepublic Photo Gallery.

What you need

To install the Windows 7 USB/DVD Download Tool, you need at least a Pentium 233 MHz processor and 50MB of free hard disk space. You can install the tool in Windows XP SP2, Windows Vista, or Windows 7 (32-bit or 64-bit). Your USB flash drive must be at least 4GB and it should not have any other files on it. In fact, I recommend that you perform a full format of your USB flash drive; just to be sure that it is error free.

If you are running Windows XP, you will need to download and install both Microsoft .NET Framework 2.0 and Microsoft Image Mastering API v2 before you install the Windows 7 USB/DVD Download Tool. Keep in mind that the most current version of the .NET Framework is 4.5, but if you only want to download 2.0, previous versions are available on the .NET site linked above.

Downloading the tool

Downloading the tool is easy. To begin, head over to the Microsoft Store's Windows 7 USB/DVD Download Tool page and scroll down until you see the download link. When you click it you'll be prompted to either Run or Save the tool, as shown in Figure A. For my example, I chose to save the file so that I could experiment with the tool on various machines.

Figure A

You can download the Windows 7 USB/DVD Download Tool from the Microsoft Store.

Installing the tool

After I downloaded the file to my hard disk, I double-clicked the executable and was prompted with a Security Warning, shown in Figure B. You'll see a similar warning if you choose to Run the installation from the download site.

Figure B

If you run the file from your hard disk, you'll see this Security Warning.
As soon as you click Run, you'll see the Windows 7 USB/DVD Download Tool Setup Wizard. The installation runs pretty quickly via the four step wizard and the first and last screens of the wizard are shown in Figure C.

Figure C

The Windows 7 USB/DVD Download Tool Setup Wizard consists of four screens.

Running the tool

Once the Windows 7 USB/DVD Download Tool is installed, I recommend that you insert your 4GB or larger USB flash drive and wait for it to be recognized. That way, the drive will be ready when you are running the tool. When the flash drive is ready, you can launch the Windows 7 USB/DVD Download Tool from the Start menu. As soon as you do, you'll encounter a User Account Control dialog box like the one shown in Figure D and will have to work through it.

Figure D

When you launch Windows 7 USB/DVD Download Tool, you'll have to work though a UAC.
When the Windows 7 USB/DVD Download Tool displays its first screen, as shown in Figure E, you'll be prompted to locate and select the ISO file. (As a sidebar, I must point out that the first time that I saw this screen I was a little startled to see Microsoft Store in the title bar - I had expected a more traditional looking wizard interface, like the one from the setup. Not a big deal by any means, it just took a little getting used to.)

Figure E

The first step is to locate the ISO file.
On the second screen, shown in Figure F, you will click the USB device button. However, as you can see, you can just as easily select DVD as the media type. (If you are running Windows XP, which doesn't include a tool like Windows 7's Windows Disc Image Burner tool, this tool comes in handy if want to burn a Windows 8 ISO to DVD.)

Figure F

On this screen, just click the USB device button.
When the third screen appears, you should see your USB flash drive in the list box, as shown in Figure G. If not, click the Refresh button adjacent to the list box. Once your drive appears, click the Begin copying button. As soon as you do, the Windows 7 USB/DVD Download Tool will perform a quick format of the flash drive, ostensibly to make it a bootable drive.

Figure G

Once your drive appears, click the Begin copying button.
Once the Windows 7 USB/DVD Download Tool begins copying the file to the drive, from start to finish the process will take anywhere from 5 to 10 minutes to complete depending on the speed of your flash drive. When it is done, the status will indicate Backup completed. The beginning and ending of the copy operation are shown in Figure H. When the copy operation is done, just click the close button in the upper right corner.

Figure H

From start to finish the process will take anywhere from 5 to 10 minutes to complete.
When the operation is finished, you can launch Windows Explorer and take a peek at the contents of your now bootable USB flash drive, as shown in Figure I.

Figure I

You can use Windows Explorer to take a look at the contents of the USB flash drive.

Booting from the USB flash drive

Once you insert the bootable USB flash drive into the system on which you want to install Windows 8, restart the system, and then follow the onscreen instructions to access the boot menu. On my test system, the boot menu looked like the one shown in Figure J. Using the down arrow, I selected the USB Flash MemoryPMAP option and pressed [Enter].

Figure J

On your system's boot menu you'll select the option that identifies the bootable USB flash drive.
Within a few moments, you'll see the new Windows flag on the screen, as shown in Figure K, indicating that Windows 8 Setup is being initialized.

Figure K

The new Windows flag displays as Windows 8 Setup is initialized.

For the best possible experience while you use the evaluation and for ease of disposal once the 90 days are up, I recommend that you install Windows 8 Enterprise to a VHD and use it in a dual-boot configuration as I showed you in the article titled Dual-boot Windows 7 and Windows 8 using a VHD.

What's your take?

Are you planning on installing Windows 8 from a bootable USB flash drive? Will you install it in a VHD dual-boot configuration? As always, if you have comments or information to share about this topic, please take a moment to drop by the TechRepublic Community Forums and let us hear from you.

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Greg Shultz is a freelance Technical Writer. Previously, he has worked as Documentation Specialist in the software industry, a Technical Support Specialist in educational industry, and a Technical Journalist in the computer publishing industry.


i did same steps two times one time with 4gb usb drive then this software gives error "files are not copy because of no space in the drirve" this error comes at 99%.

second time I use 16gb flash drive with formatted with ntfs, files are copied successfully but it give me error that "it does not create bootable click on online help"

really a stupid product.


@raomohsinkhan Hi, did you figure how to use ntfs format for your pendrive? The version of windows I want to put in the pendrive is 4.86 GB so fat32 won't do.


Thanks a lot!!! Was struck up with Automatic repair failed problem in Windows 8!!! Now i could reboot again using my USB and reset the system again!!!

Gareth Cloud 4 Computers
Gareth Cloud 4 Computers

Great article Greg, good to see some useful information being put on the blogs please keep it coming.


nice one,,hope it work's to me,,this is the latest way.,,im waiting for this thanks any why i try now to my laptop hop it works,,


Hey, I've been trying without luck (so far) to install Windows 8 on my UEFI system. The USB has to be formatted with the file system set to FAT32 in order for the UEFI bios to recognize it as valid or it defaults to legacy and I can't install Windows using the GPT partition format. So NTSF is not compatible with UEFI, and FAT32 as you must know has a file size limit of 2GB. The problem being that in the sources folder of the Windows 8 DVD is a file called "install.wim" that weighs 4.3GB, so it fails to be copied when I try to use the utility (Universal-USB-Installer) and the Microsoft utility (Windows7-USB-DVD-tool) converts the partition to NTFS making this a total bust for me. Any suggestions?

Bart Mensfort
Bart Mensfort

Instead of installing Windows 7 USB/DVD Download Tool Setup Wizard, I prefer to use the UNETBOOTIN tool. That should be easier to use. Does anybody know if that works? Too bad Windows 8 does not install next to other releases... quite arrogant.

D Pike, P.Eng MCITP
D Pike, P.Eng MCITP

Fabulous article, Greg. I have been looking for this on the Microsoft website for quite a while. Even spent a couple of hours last week going in circles without finding the link you've given us. And I'm a partner! I will never again burn a DVD, label it, and keep them all organized, when I can just keep the latest installables on disk, and load them onto a flash drive when I need it. How often have we come to do an instal only to find that the DVD drive doesn't work? I've yet to find a functioning computer whithout a working USB port. Q: Will this work on all modern Microsoft software: Server 2012, Project, Link Server, System Manager, Office. for example? Does it work for other Windows apps: Adobe, Quickbooks, etc.?


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Thanks for sharing this. I was wondering if it might be possible to load more than one ISO on the flash drive so that after it boots you could choose which OS you wanted to install, say Windows 7 or Windows 8? That would be really convenient to be able to install multiple operating systems from one source.

Mark W. Kaelin
Mark W. Kaelin

With many of the new notebook PCs shipping without DVD drives, having a bootable USB flash drive that you can use for installing an operating system is almost mandatory isn't it?

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