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: How do I partition an existing Windows 7 OS?

18 Jun 2010   #11


Your plan is fine, and you can indeed use Partition Wizard bootable CD if in the second shrink operation Disk Mgmt will not shrink C: enough. Always back up your files any time you use a 3rd party DIsk Manager.

However you might also need to use the best tool which will move System files if they are blocking shrinkage: Perfect Disk 11's trial version Offline/Boot time defragger for System files.

After downloading PD, set Defrag drop-down menu to Consolidate Files. When this completes, attempt shrinking again. If that is not enough, then rightclick C: drive and do Offline or Boot time defrag selecting "System" files.

My System SpecsSystem Spec
18 Jun 2010   #12
Greg S

Windows 7 Professional 32-bit (6.1, Build 7600)

Quote   Quote: Originally Posted by whs View Post
1. Leave the 100MB partition alone. That is your boot partition. It should be called "active". Just don't touch it.
2.All you can shrink with Disk Management will be the 430GBs. Later it will not let you shrink any more - that's why I suggested Partition Wizard. The reason is the MFT that Disk Management will not move, but PW will. Another problem would be that the freespace you want to add to a partition has to be to the right of that partition (with Disk Management). No way to extend a partition to the left - except with Partition Wizard.
I have a question. As of right now, I'm dual booting XP and Seven. I have one disk, two partitions. C: has XP which was installed first, E: has Win 7. Before installing Win 7, I shrunk C: of course to create E: to install Win 7. At the time I really didn't think I would use Win 7 all that much and used little more than the minimum space for the installation of Win 7. As it turns out, Win 7 appears to be great and now I regret not having more space on E: for it. Here comes the question, can I shrink C: and add the space to E: Win 7? I've always assumed I couldn't but honestly don't know for sure.
My System SpecsSystem Spec
19 Jun 2010   #13
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8

This is of course possible. With Disk Management it is a little awkward because your free space will be to the .left of E after you shrunk C. But with Partition Wizard you can extend a partition to the left. To be on the safe side, I would image the 2 partitions with e.g. Macrium. Normally the shrink/extend should not impact the data in those partitions, but one never knows.
My System SpecsSystem Spec

19 Jun 2010   #14

Microsoft Community Contributor Award Recipient

Windows 7 Ult x64 - SP1/ Windows 8 Pro x64

Great advice given here already.

Try to use the Windows Disk Management, it will likely not give you the size you want, Partition Wizard is a very good program.

As whs mentioned use an image backup program first, alway make a backup before doing something like this. Best safety insurance is to always keep a backup, soon after installation. Macrium is free and very good.

Greg S, Disk Management won't let you move a partition to the left. Use Partition Wizard, it will do it without a problem.
Let us know if you have any questions.
My System SpecsSystem Spec
19 Jun 2010   #15

Windows 7 Ultimate 64-bit

Thanks, everyone, for your response and help to my post.

You all raised very good points and concerns. I have read all the associated information and links and now feel comfortable to partition my disk the way I want it to be. I've purchased Acronis for backup and got Partition Wizard for Home Edition to help me better move and create partitions.

Now to work.
My System SpecsSystem Spec
19 Jun 2010   #16


Greg S, do you want to delete XP before you resize Win7 into its space?

If so you'll also need to use free Partition Wizard bootable CD: mark Win7 Active using Partition Wizard, do the delete/resize, then apply all steps.

Now boot into Win7 DVD Repair console or Repair CD, click through to Recovery tools list to run Startup Repair up to 3 separate times with reboots until Win7 will start.
My System SpecsSystem Spec
19 Jun 2010   #17
Greg S

Windows 7 Professional 32-bit (6.1, Build 7600)

Quote   Quote: Originally Posted by gregrocker View Post
Greg S, do you want to delete XP before you resize Win7 into its space?
Negative, I'm just looking(if possible) to add space from C: partition to E: partition which has Win 7. Before installing Win 7 I had only the one disk/partition which has XP. I used Gparted to shrink it by 17+ gigs which was used for E: to install Win 7. I'm fully backed up going back as far as the day before installing Win 7(10/23/09) to the most recent about 3 weeks ago.
My System SpecsSystem Spec

 How do I partition an existing Windows 7 OS?

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar help and support threads
Thread Forum
How do I resize a partition on an existing hardware RAID0?
Hi, I have a single partition (E) on a 1TB hardware RAID0. This drive contains some installed programs and data. I would like to resize the existing partition, and then create a new partition such that I have: E: ~500GB F: ~500GB I booted from a YUMI USB multi-boot and opened...
General Discussion
How to change sector size on an existing partition?
I am trying to change the sector size of a partition either higher or lower than what is reported now. Using the ADMIN | Computer Mgmt tools to shrink the partition does make it smaller, but the sector size stays the same. The one I am trying to change the size of is a logical drive inside an...
Hardware & Devices
create dual boot partition from exisiting W7 partition on existing HDD
I would like to create a bootable partition from an existing Win 7 partition. I have two partitions bootable now. Both Win 7- one with dragon dictate and various software I am trying out (on a 1.5 TB drive) and the other is my regular boot partition on an SSD with the system reserved partition. ...
Installation & Setup
Setup unable to create a new partition or locate an existing partition
I bought a fairly new eMachines E528-2325 from a friend. before buying he decided to use DBAN 2.2.6 to wipe Windows 7 and install Ubuntu 11.04, after buying i requested him to reinstall Windows 7 using usb, so he again used DBAN to wipe the computer. Upon trying to install windows he got the error...
Installation & Setup
Missing existing partition
Hi I have a 250Gb HDD that is partitioned into two parts. I run W7 32bit. I have alwyas had the second partition as D drive and the first partition containing my boot as C drive. I recently added an external hdd and this is shown as E drive - my DVD is set as G drive. When I go into...
General Discussion
Can't get W7 to install over existing vista partition
I'm trying to install W7 on an HP DV6-1253cl notebook from a USB flash drive and running into problems that are preventing the install. (Note: It's not the rig that is in my system specs.) When I try and clean install Windows 7 64-bit over the existing Vista system partition (C), I get the...
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 14:55.

Twitter Facebook Google+

Windows 7 Forums

Seven Forums Android App Seven Forums IOS App