How to Install Windows 10 from an External Hard Drive

It so happened this week that my old favorite USB 3.0 pendrive stopped working. I have used it to install Windows a zillion times. I have USB 2.0 pendrives but they are very slow when copying or reading files. So I decided to use my external hard drive as the installation media to install Windows 10 on my new laptop. Here  are the steps I took to successfully install Windows 10 using an external hard drive:

Note: Before beginning, make sure that you have downloaded Windows 10 ISO image from Microsoft servers and have installed 7-Zip in your PC. The external hard drive should have only one MBR partition (you can use MiniTool Partition Wizard to create an MBR partition). If you have some files on the external hard drive, make a backup of these files on some other device.

  1. Attach your external hard drive to your PC using the USB cable.
  2. Right-click on the external hard drive in File Explorer and select Format. Select file system to be NTFS and choose Quick Format in the formatting dialog.Install Windows 10 from External Hard Drive
  3. Right-click on the Windows 10 ISO image file, select 7-Zip → Open Archive. Then extract all the files from the ISO to the external hard drive.Install Windows 10 from External Hard Drive
  4. Open an elevated command prompt. Assuming F: is the drive letter for your external hard drive, give the following commands:
    cd boot
    bootsect /nt60 f: /force

    Install Windows 10 from External Hard Drive

  5. Now we have to use the diskpart tool to make the partition on external hard drive bootable. For this, in the elevated command prompt we give these commands:
    list disk
    select disk 1
    list partition
    select partition 1

    Assuming that “list disk” displays the external hard drive as the disk no. 1 and the “list partition” displays the partition no. 1 for the first partition in the external hard drive.

  6. Now you can reboot your PC and when press F12 to select a boot media when the PC is about to start. Select the “Mass Storage Media” from the list to start the Windows 10 installation.

If your computer is not able to boot using the external hard drive, then try turning off the PC and the external hard drive both first and then power them up at the same time. This is because some portable hard drives stop spinning when Windows is rebooted.


  1. i have a external hard drive of 250 gb but after installing window from it computer show its storage only 32 gb .how i recover my storage help me

  2. When I reboot my PC with F12 and select boot from external USB device I get the message “SPFDisk Boot Manager kernel load failure…..” Any idea how to solve this?

  3. Works for me. I used this for installation of windows 10. Quick and simple.

  4. Thank you, your giude so helpfull. I have been wasting my time to figure how to install it via hdd and ur website pop up.
    Just another question, What should i do when i want to use the hdd normally like before formating? Should i format it back?

  5. Can I recover my files?
    I used an external hard drive to install windows 10 but I didn’t back up my files. When I installed, all of my files were disappeared.

  6. Step 2 — But do I have to delete all my other files – movies, pics, etc. from my external hd?

    1. External hard drive should have MBR partition and it should be NTFS formatted. First 2 steps are for ensuring that. Following any of these first 2 steps will destroy data on your external hard drive. But if your external hard drive already satisfies these two conditions, then you do not have to delete anything.

  7. Is it just for a MBR installation, right? No GPT support? It appears as legacy at boot.

    1. This is just installation media. GPT support for your target hard drive depends on your UEFI/BIOS configuration.

  8. So anyone know how to prepare that external drive with Ubuntu? :’D
    I was able to delete my whole Windows installation…

  9. Hi I would just like to say this is the most underrated page on the entire internet. I have been searching, reading, and watching videos for hours trying to figure out if there was a way to install Windows without a USB stick or DVD (because honestly who still uses those).

    Finally I found this page and it saved my life.


Comments are closed.