Read this first, It will take you a while depends on how much Windows Space is used, in my case it took 1 hour for 60G used windows space. So keep it charging.

 

Today I was running into a issue to change partition size after bootcamp and Windows System has been installed. You cant do this through BootCamp manager since it can only remove Windows partition which is definately we want. 

 

To do this, you need 

1. Boot with Gparted(CD or USB), a free tool perfectly suitable for this situation.

2. From Gparted, Shrink disk space from MAC side(make sure you shrink the right side part of MAC side which can be used by Windows Partition.

3. From Gparted, Extend the disk space of BootCamp(Make sure the disk space is next to Boot Camp, other wise you cant extend it.) 

4. Boot with Windows Installation Disc to repaire the MBR and Boot Sector of Windows side. 

 

 

Lets begin!

1. Boot with Gparted(CD or USB), a free tool perfectly suitable for this situation.

1-1 Go to http://gparted.sourceforge.net/livecd.php to download Gparted. Follow instructions at:

http://gparted.sourceforge.net/liveusb.php

to make a USB Bootable disk.

1-2. Restart MAC and boot from USB by holding "Option" key. Choose options suits you to load Gparted.

2. From Gparted, Shrink disk space from MAC side(make sure you shrink the right side part of MAC side which can be used by Windows Partition.

Choose the MAC partition and choose Move/Resize, drag the left side of the harddisk space to prefered size. Dont Apply yet.

3. From Gparted, Extend the disk space of BootCamp(Make sure the disk space is next to Boot Camp, other wise you cant extend it.)

Extend Windows Side by choose BootCamp and Move/Resize it. Simply drag the start of the disk to left side to utilize all the disk space. In my case, I deleted the partition for restore since it is inbetween Mac and BootCamp. Carefully do this only if you are confident to restore it.

Apply the pending actions, it will take a lot to time since it will copy all the content of BootCamp to the new assigned disk space, to the very start of the left side. In my case, it took 1 hour for 60G used disk space.

4. Boot with Windows Installation Disc to repaire the MBR and Boot Sector of Windows side.

Now it`s most important part, fix boot configuration since Gparted will definately broke the MBR and boot information, you will get a no OS found error if you dont fix it. Dont stress, it is expected, here are the steps:

4.1 Boot with Windows Installation CD, choose Repair other than install.

4.2 If no Operation found on the list, It is OK, still choose Use Recovery tools and then select Command Line Tools.

4.3 Command to fix this.

C:
C:\> diskpart
DISKPART>Show DISK
REM select the disk where Windows installed
DISKPART> Select disk 0
DISKPART> Show Partition
REM select the boot camp partition
DISKPART> select partition 3
DISKPART> active
DISKPART> extend filesystem
DISKPART> exit
REM choose "all" or "Y" for next command
C:\> bootrec /rebuildbcd

 4.4 P.S. You will be asked to run a Disk Check and Repair when you boot from you fixed Windows, let it finish and restart. Done!

REF: 

1. http://forums.macrumors.com/showthread.php?t=1312171

2. http://superuser.com/questions/241739/windows-7-cannot-boot-bootrec-reports-fs-not-found-or-corrupt

 

 

 

About Lei

I am an IT specialist with over 10 year experience - years on Automation, on-Premise or Azure.

I am happy to develop however never want be a full time developer. Only do what I have to do. If it has to be PowerShell,HTML, PHP, CSS, C#, VBS or JS, front end or backend, so be it, doesn't matter!

Spent years with Windows, SCCM, SharePoint, SQL and Exchange servers. For last several years, I have been actively working under On Premise > Azure environment.

THERE IS NO WAY BACK!!!

Current Certificates:
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  • -Enterprise Administrator
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Working on Azure Certificates now and hopefully they can stop upgrading their questions one day! GIVE ME A BREAK!

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