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: Dual boot Overwrite

11 Dec 2010   #1

Win 7 64 Ultimate
Dual boot Overwrite

Maybe you guys can tell me what to expect before i screw my system up. I have 2 drives installed in my desktop one is an 80gb drive with windows 7 32bit installed on it, this one i use for my every day use.
I also have a 250Gb drive with Vista 64 home premium. The Vista install was my everyday drive untill i got W7U32b when i got W7U32b i bought the 80gb drive specifically to install the W7U32b to so i wouldnt loose what i had on my vista drive,,, needless to say ive never even gone back to use the vista drive since then except to copy files over to the W7U32b drive .
I want to now install W7U 64 bit over the vista drive. Right now when my system boots i have the option of starting in win 7 and or vista. If install w7u64 over the vista install will i then have the option to boot in either w7u32b or w7u64 bit? i DO NOT want to loose the W7U32b drive data!!!
Ive done some searching around but didnt find anything similar to this. Any info would be much appreciated!!

My System SpecsSystem Spec

11 Dec 2010   #2

Windows 7 Ultimate x64

To answer your question specifically, I'm not sure how windows boot manager works for same versions of windows. In the past, you install the older os followed by the new one. In this case it's the same. But, someone will come by with a detailed answer soon i'm sure.

In the meantime, have you considered formating the vista drive, and using it to host a virtual machine from? I suspect you want to play around with application compatibility, driver support, etc. and virtual machines make it so convenient.
My System SpecsSystem Spec
11 Dec 2010   #3
Microsoft MVP

W 7 64-bit Ultimate

Hello JRockZ, welcome to Seven Forums!

As you have separate Hard Disk Drives, the best way would be a BIOS managed dual boot, using the BIOS one-time boot menu specific to your motherboard to manage the dual boot.

But before we make any specific recommendations will you please post a snip/screen-shot of the entire disk management drive map with a full description as to which drive/partition is which, so we can see what you have going on.

In the Windows start menu right click computer and click manage, in the left pane of the "Computer Management" window that opens click disk management and post a snip of that.

How to Upload and Post a Screenshot and File in Seven Forums
My System SpecsSystem Spec

11 Dec 2010   #4

Win 7 64 Ultimate

Thanks guys, to anser "Bare Foot Kid" heres a clip of my drives layout
C: Drive Windows 7 Ultimate 32 Bit
D: Vista Home Premium 64bit

Attached Images
My System SpecsSystem Spec
11 Dec 2010   #5
Microsoft MVP

W 7 64-bit Ultimate

I'm walking out the door to go to work.

Here's how to get started.

Disconnect the "Disk 1 Vista" HDD from the mobo; set the "Disk 0" HDD as second in the boot order in the BIOS after the CD-ROM, boot the Windows 7 disk and do the startup repairs discussed in this tutorial at the link below.

Startup Repair - Run 3 Separate Times

That will remove the Windows managed dual boot and make the HDDs independent.

Then power-down and reconnect the "Disk 1" HDD and use the BIOS one-time boot menu to select the HDD/OS to boot.

One-time Boot Menu
  • Asus - F8
  • HP/Compaq - Esc
  • Sony - F2
  • Acer - F2
  • Gateway - F10
  • eMachnes - F10
  • Toshiba - F12
  • Dell - F12
  • IBM/Lenovo - the blue Thinkvantage button
My System SpecsSystem Spec
11 Dec 2010   #6

Win 7 64 Ultimate

Bare Foot Kid Thanks thats exactly what i thought you would say Hahahaaa! The start up repairs part is what scares me but i'll get it!! will report back when i get around to doing it and let ya know how it went.
My System SpecsSystem Spec
11 Dec 2010   #7
Microsoft MVP

W 7 64-bit Ultimate

OK, be sure to post bacl to keep us informed.

I've done more startup repairs than I could begin to count, both in Vista and Windows 7 and they're nothing to be concerned over.

Using a BIOS managed dual boot as opposed to a Windows managed is the way to go as you are able to remove a single HDD/OS at will and the other will still boot.
My System SpecsSystem Spec
11 Dec 2010   #8
Microsoft MVP


Have you now confirmed that the one-time BIOS Boot menu works to boot the OS HD not set to boot first in BIOS setup?

If so when you install Windows 7 64 bit on DISK1 unplug DISK0 so that the installer doesn't configure a Windows-managed Dual Boot with Windows 7 32 bit which would place the System boot files on DISK0.

Be sure to set DISK1 as first HD to boot in BIOS setup.

After 64 bit install, plug back in DISK0, set preferred OS HD as first to boot in BIOS setup, boot the other OS HD using the one-time BIOS Boot Menu key. This keeps the HD's independent to come and go as you please.

If you have a rare mobo which doesn't have the one-time BIOS Boot Menu key, or prefer not to Dual Boot using the BIOS, then keep DISK0 plugged in when you install Windows 7 64 bit to DISK1 so it configures a Windows-managed Dual Boot.
My System SpecsSystem Spec
26 Dec 2010   #9

Win 7 64 Ultimate

Hey All,, rathe rthan unplugging my sata drives and dealing with a big mess inside my pc i just went into my vista install and did an in place upgrade worked perfect and been using it a week or two now, i did have to go in and BCD edit so that i could name my two installs one as 32 bit and the other as 64 bit.
Thanks for all the help.
My System SpecsSystem Spec
26 Dec 2010   #10
Microsoft MVP


Since you already have a WIndows-managed Dual Boot and apparently don't want to change that, you can also clean install Windows 7 directly to DISK1 if you have any issues with the in-place Upgrade from Vista. Clean Install Windows 7

Sometimes an in-place Upgrade can suffer from importing corrupt settings from Vista. I wouldn't settle for less than instantaneous performance.

Windows 7 installer will configure the Dual Boot menu with the other Windows 7.
My System SpecsSystem Spec

 Dual boot Overwrite

Thread Tools

Similar help and support threads for2: Dual boot Overwrite
Thread Forum
0xc000000e Boot Selection Failed - Dual-Boot Boot Sequence Issue? General Discussion
Dual boot / Dual Drive queries Installation & Setup
windows 7 and linux fedora dual boot with dual drives General Discussion
dual boot , reinstall the windows and lost dual boot Installation & Setup
Help with dual hard drive/dual boot General Discussion
How do I keep Win 7, Dump XP from dual drive, dual boot Installation & Setup
Dual Boot Issue (Lost my Dual Boot Menu) 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 03:37 AM.
Twitter Facebook Google+

Windows 7 Forums

Seven Forums Android App Seven Forums IOS App

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33