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: WIndows 7 dual boot with XP, boots from wrong drive

05 Jan 2010   #1

W7 RC x64
WIndows 7 dual boot with XP, boots from wrong drive

Hi. I installed windows 7 x64 RC a while back, and it detected windows xp and set up a dual boot. All was well.

I had a PSU failure, and i replaced the PSU. I set the BIOS to boot from the drive with windows 7 on it. It wouldn't boot. I set the bios to boot from the drive with windows Xp on it, and it booted to the dual boot screen.

Apparently, windows 7 placed the boot information on the old XP drive, so if i try to boot to windows 7 from the windows 7 drive, its a no go.

Now, this wouldnt' bug me so much, except that i want to replace the Xp drive with a larger 1tb drive. I don't need XP anymore, and do need storage (xp drive is 160gb).

if i remove the XP drive, windows 7 won't boot. How can i fix this?

My System SpecsSystem Spec
05 Jan 2010   #2

Windows 7 x86/x64, Server 2008r2, Web Server 2008

Put your install disk back in,
tell it to do a repair.
and that should find it :)
My System SpecsSystem Spec
05 Jan 2010   #3

W7 RC x64

aw man, i installed RC1 a while ago and i'm not sure i have the DVD. I guess i will have to look for the image.
My System SpecsSystem Spec

05 Jan 2010   #4
Microsoft MVP


Mark Win7 active in Disk Management.

Unplug your XP HD. Make sure Win7 HD is first HD to boot in BIOS, after DVD drive.

Boot into Win7 DVD Repair console, click through to recovery tools to run Startup Repair 3 separate times with reboots. This rewrites the MBR to WIn7 HD.

Now you can plug the XP back in, remove Win7 from dual boot in msconfig>Boot tab.

Then boot either one from the BIOS shortcut key for Boot Menu, set Win7 HD to boot first in BIOS. Drives are now independent and can come and go as you please.

If you will post back a screenshot of your full Disk Management drive map first, we can advise you more fully.
My System SpecsSystem Spec
05 Jan 2010   #5

Windows 7 x64

He does not have the boot folder or bootmgr file on the Win 7 drive. Copying those things to the root directory of the Win 7 drive prior to doing a startup repair should really help. Also, probably a good idea to make the partition acitve, but the repair might do that.

These items are hidden system files, so you will have to set folder options to be able to see them. If you can't get them from the XP drive, they are also in Windows 7 and on the Win 7 install DVD.
My System SpecsSystem Spec
05 Jan 2010   #6

Microsoft Community Contributor Award Recipient

Vista x64 / 7 X64

If you can't find the install media/repair cd - you can always download one.

Download Windows 7 System Recovery Discs — The NeoSmart Files

Or use Easybcd 2.0 change boot drive feature.

EasyBCD 2.0 Beta Builds - The NeoSmart Forums

Install it on 7, select Diagnostics Center, Dot Change boot drive , click Rescue my system , select the 7 drive letter in the drop down- OK - let it do it's thing.

As long as 7 HD is the first ( or only ) HD in boot order - you're good.
My System SpecsSystem Spec
06 Jan 2010   #7

W7 RC x64

Thaqnk you so much. EasyBCD 2.0 worked perfectly. I booted from my win7 drive without the xp drive attached, now, i can finally remove that ancient harddrive, and install my new fancy tb harddrive.

life is sweet.
My System SpecsSystem Spec
06 Jan 2010   #8

Microsoft Community Contributor Award Recipient

Vista x64 / 7 X64

You're welcome. Glad to hear it.
My System SpecsSystem Spec

 WIndows 7 dual boot with XP, boots from wrong drive

Thread Tools

Similar help and support threads
Thread Forum
My Dual Boot setup has the boot mgr on the wrong drive
I have managed to get myself into a situation where the "System Reserved" partition is on a different physical drive from my current C drive. This is, I presume, as a result of creating a dual boot system without fully understanding the consequences. I need to correct this because I intend to...
Installation & Setup
Two HDD's, Dual boot, Wrong Drive is SYSTEM
The simplest way to put my problem is that in DOS, I could solve it with "sys C:\" then FDisk to make sure the drive I want is Boot, Active and System. Some years ago, I set up a 1 TB SATA drive to dual boot XP Pro 32 bit and 64 bit. Lots of things changed since then but drives C:, D: and E:...
Installation & Setup
Dual boot - installing XP after 7 - what boots after XP restarts?
Hello I'm trying to make a dual boot installation following Brink's tutorial (Method 2). My problem is the following: what should boot after windows XP has first copied the files onto the hard drive (text based) and is supposed to restart into graphical mode? Is the CD then booted or the hard...
Installation & Setup
Dual-boot Windows 7 and Ubuntu Netbook Remix; gone wrong.
It all started like this.. I bought my HP-laptop 4 weeks ago. 2 days ago I decided to dual-boot the pre-installed Windows 7 with Ubuntu Netbook. Thought it was a good idea. Well, I created a partition for Ubuntu on 100GB on my current HDD and the whole disk went from a Primary Disc to Basic...
Windows Updates & Activation
System Boots to wrong drive
I have two hard drives in my Win 7 Pro Computer one is a boot driver with programs and the other is a data drive. On several occassions now the computer attempts to boot to the data drive. I have had to go into the SETUP and change the drive sequence and the correct drive to boot to. Any...
General Discussion

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 10:24.
Twitter Facebook Google+