How can install Windows 7 on an external hard drive [Windows OS Tweak]

If you ever tried to install a Windows on a external hddSurely you were greeted by a error message saying that "Setup does not support configuration of or installation to disks connected through a USB port or IEEE 1394"(At least when Windows 7 this is the message). The conclusion? Unable to install Windows on external hdd.

But the truth is another. You can install a Windows OS on an external hard driveBut the installation is done in a way different from the standard.

To install Windows (Windows 7 in our case) on an external HDD you need the following:

  • primarily a GB external hard drive with minimal space 16 (Before you start the installation of Windows on the external HDD is recommended make a backup of the data on your hard - If any - to ensure that they will not "suffer")
  • Windows installation files (in this case DVD or Windows installation image 7 - Plus software to mount the image)
  • Windows Automated Installation Kit (or WAIK), Which you can Download free from the Microsoft website.

Step 1.

Create two new folders on one partition that has 5GB minimum space, and name them Windows Files si WAIK Files


Step 2.

Download next archive and extract its contents folder WAIK Files


Install WAIK server, then search for these files in the partition that you have installed WinXP (ie C:; files will be available only after installing the WAIK server):

  • bcdboot.exe
  • Bootsect.exe
  • ImageX.exe

and copy them all in folder WAIK Files

Step 3.

Extract the installation files Windows 7 (DVD or the mounted image) folder Windows Files

Step 4.

WAIK Files folder, right click on installer.cmd and select Run as administrator


Step 5

type Enter and select install.wim window open

1 2

Step 6.

Select 7 Windows edition you want to install allocated by typing its number (in this case 5 figure)


Step 7.

type letter allocated external HDD (in this case letter X)


Step 8.

tap active partition allocated letter (Ie partition where the operating system is installed, usually - as in this case - letter C)


Step 9.

type Y when you are asked if the drive on which to install Windows is connected via USB and then let Enter


Step 10.

Retype Enter to begin 7 Windows installation on external HDD. If you are going to look like the installation process takes a little longer than standard installation, keep in mind that in this case it comes to install Windows on an external hard drive.


Step 11.

After the installation process will reach final reboot your PC for the last settings can be made.


Once complete installation, you can install any software and drivers you want. You have (yet) a sisitem fully functional Windows 7.

Note: For this tutorial we used a Windows installation image 7 x86, but it is perfectly true for Windows 7 x64.

How can install Windows 7 on an external hard drive [Windows OS Tweak]

About the author


Passionate about everything that means gadgets and IT, I write with pleasure from 2006 and I like to discover with you new things about computers and operating systems macOS, Linux, Windows, iOS and Android.


  • Lze to jednoduše na programu pomoci 3 kliky WinToUSB:
    STAHN and free green ISO Windows prohlídni and tutorial na programu stránkách. 10 minute Za Win na mas připravené USB. Spustíš PC / NB / z připraveného nabootuješ USB to USB normalne Windows nainstaluješ na. Nezapomeň při Kazda restartu opět bootovat z USB.
    Win Vyzkoušeny 10 of vše OK.

  • Hello.
    But after I reset to pc ... should I step by step?
    What keys do I use to be able to continue to install on external hdd?

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