Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: Installing Windows 7 to 2TB EFI External Hard Drive

13 Mar 2015   #1

Windows 7 Home Premium 64 bit
Installing Windows 7 to 2TB EFI External Hard Drive

First of all I know that installing Windows on an external hard drive is far from ideal, and this is only meant as a temporary solution. My SSD died, ordered a new one, seller sent wrong one and have to go through return procedure. I need access to Windows on my desktop urgently, and the only drive I have at my disposal is a 2TB EHD, and my PC will only boot EFI and ACHI.

The Petition Table of my EHD is as below:

I have a laptop with x64 Windows 7 Home Premium in which I've used the fast installer tool here, and followed the instructions:
How To Install Windows 7 On USB Flash Drive or External Hard Drive

However when I plug it into my desktop, and select the drive from the boot menu it doesn't boot
My System SpecsSystem Spec
13 Mar 2015   #2

Windows 10 Pro X64

I had this link squirreled away, maybe it will help: How To Install Windows 7 To USB External Hard Drive [Must Read]

Got to learn to read better
My System SpecsSystem Spec
13 Mar 2015   #3
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8

Long time ago I wrote a tutorial on how to do that. Maybe you want to try. But I warn you - it is going to run like molasses from a HDD - and forget USB2. eSata is best. You are better off with a fast USB3 stick with an access time under 1ms. It is the 15ms access time of a HDD that kills you with the OS.

Windows 8 To Go - Setup on a USB Flash Drive or USB Disk
My System SpecsSystem Spec

13 Mar 2015   #4
Microsoft MVP


How was the HD transferred onto the external?

You can try removing the 2.5" laptop HD from the external to install it in the laptop but I would not sacrifice the external because it is going to be a long shot given numerous hurdles I'll explain.

The chief problem that most installs moved to new hardware won't boot due to a conflict between drivers, HID and SID. This is normally resolved using Paragon Adaptive Restore disk to Adjust Win7 to boot on new hardware with Paragon Adaptive Restore CD however the version in the tutorial does not have EFI support, so if it won't start even with Startup Repair you'd need to look into the latest adaptive restore with EFI Support to either transfer the or adjust the image.

If that is your only copy of an important install I don't think I'd mess with it, but instead use a copy. I'd keep it pristine so that when your new SSD arrives you can clone it directly using a flexible app like Macrium Imaging - Windows 7 Help Forums.

As to making the external bootable via USB, it would need to be installed that way and that can't be done with the existing as far as I've seen. But it may depend upon how the image got there and how it is otherwise preserved if at all.
My System SpecsSystem Spec

Thread Tools

Similar help and support threads
Thread Forum
Hard drive appears wiped after installing Windows 7 to another drive
Hey all, somehow my 1TB hard drive was wiped out and I've lost 930GB worth of files from the past 8 years. I don't have any backups (stupid me). My hard drive contains lots of family vacation photos and videos, old school projects I'll need in the future, and loads of other really important stuff....
Hardware & Devices
problematic step in installing windows 7 on external hard drive
Hi everybody!! I am trying to instal windows 7 on external hard drive following How To Install Windows 7 On USB Flash Drive or External Hard Drive the boot from this drive did not work and I have a suspicion what the problem could be. when i have to indicate the first active...
Installation & Setup
Windows 7 updates, installing to external hard drive?
I've recently plugged in an external hard drive onto my computer and noticed when performing a windows update, the temporary files are put onto the external hard drive. Upon a restart, the files are gone from the hard drive. My question is, are the windows updates installing onto the external...
Windows Updates & Activation
Installing Intel® Chipset Software while external Hard drive pluggedin
Hello I have some questions to ask Recently I have done a fresh install of window 7 professional but when I was installing "Intel® Chipset Software(Intel Cougar point chipset driver)(SB bus controller) while my External hard drive was plugged In( For drivers to be installed) the screen...
Installing Win7 from usb_drive (or external hard drive)
Hey there, Okay I have a netbook. It came with win7 starter (and a lot of bloatware lol). I have a seperate copy of win7 home premium (on dvd) that i purchased. There's no dvd/cd drive on netbook and I will not be purchasing one for it. (defeats the portability of netbook!). So, is...
Installation & Setup

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

© Designer Media Ltd

All times are GMT -5. The time now is 10:51.
Twitter Facebook