how to resize my bootcamp partition without deleting itit

Same here, my bootcamp partition is not recognised anymore. There seems to be a MBR/GPT mismatch and I don't have a clue how to fix it yet...

"Mini tool partition" is definitely not the right tool to use!

Worked! thanks

Hi, I had a similar issue as the author originally had, however after making the changes suggested in this thread i am no longer able to boot into windows partition, nor I see it from OS X:

Bootcamp partition is no longer visible and bootable

You might want to consider starting a new discussion. Since this one is marked solved, less people are likely to look at it. You can link to this one.

Thank you a bunch. This worked perfectly.

Regarding "Using OSX Disk Utility resize MacintoshHD partition", for some reason, the resize "handle" is not present so Disk Utility won't let me resize the Macintosh HD partition in the first place. Any idea why this would be the case? There is probably 500GB of free space on it, so that can't be the reason. Any ideas welcome

Inside Windows work perfect but after recreating the boot of Windows because the system said could find the boot and stuck, I used this to recover the boot:

http://www.sevenforums.com/tutorials/20864-mbr-restore-windows-7-master-boot-rec ord.html

Nos my problem is inside "Disk Utility" of OS X Yosemite the resized unallocated space I made following your step 2 still there like if it was never taken by the mini tool partition for example I had 79 GB and resized to 120GB and in "Disk Utility" still showing my boot camp partition like if it was 79GB not 120GB and in the side of Windows running Windows and mini tool partition is perfect the 120 GB are visible space because mini tool added to the 79GB the problem with that is if I want to make a backup with winclone or anything from OSX say is a big problem in my boot camp partition and of course is because windows mini tool assigned all perfect to make 120Gb but OSX never detected that change and takes like a buggy partition, however I can access the boot camp partition from OSX to copy files and all but I can't read from winclone or do something from"Disk Utility", "Disk Utility" is in the state like your step 2 show 79GB for my boot camp partition the supposed unallocated space (that is not because mini tool already assigned) and the main partition of my MAC reduced after resize it.

Anyone know how to fix the issue to make the fix from OSX side that "Disk Utility" show all what mini tool did and dexters all perfect?

THank you

Hi all,

I was also in big trouble with my MacBook Pro after I expanded my BootCamp partition (by first shrinking the MacintoshHD partition using OS X Disk Utility, then expanding the BootCamp partition using Windows 7 Disk Management in Computer Management - right-click on BOOTCAMP C: and select Extend Volume...) and then applied some system updates for OS X (Yosemite 10.10.3).

Then the BootCamp partition appeared in Disk Utility as "disk0s4" and was not accessible anymore (no BOOTCAMP icon on the Desktop, and no BOOTCAMP item in the Startup Disk selector). When I tried to boot Windows using the Alt-Option key at startup, it failed with a text-mode Disk Read Error message.

Then I installed some tools to try to recover and fix the damaged partition table.

The first tool was "gdisk" aka GPT Fdisk that I downloaded from http://sourceforge.net/projects/gptfdisk/ and installed in OS X. This tool showed that some unallocated space existed between the end of the RecoveryHD partition and the start of the BOOTCAMP partition. This space was added to the BootCamp partition in Windows (in the MBR), but NOT in the GPT (used by OS X). It seems that at some time, the MBR has been re-synced with the GPT and consequently Windows failed to boot.

Then I needed a tool to fix the start sector of BootCamp in both the MBR and the GPT.

I found a tool named GPartEd Live (for GNOME Partition Editor) here: http://gparted.org/livecd.php and I transferred it from the CD-ROM ISO image to an USB key using another tool named UNetbootin (for OS X) downloaded from http://unetbootin.sourceforge.net/ .

To be able to boot that USB key I needed to install rEFInd (a fork from rEFIt, compatible with Yosemite). To install it I downloaded the iso image from http://www.rodsbooks.com/refind/getting.html, mounted it (click on the downloaded image, then close the Finder window), opened a terminal session, changed to the directory where the iso is mounted (in /Volumes/rEFInd-0.8.7) and executed the command $ sudo ./install.sh .

So, eventually I managed to boot the USB key containing the GPartEd Live tool and I started using that tool.

In the tool there is an option to move/resize a partition. I decided not to use that option, because if I extended the ntfs partition to the left, it would have moved all data from the old area to the begin of the new area destroying valuable data, and everything would have been lost forever.

Instead, I deleted the ntfs partition and created a new unformatted partition taking the whole unallocated space. I applied the change and TADA, the new partition was magically recognised as NTFS ! I did a check using GPartEd on that new partition and everything looked fine.

So I tried to boot directly on BootCamp, it started loading Windows, but got stuck on the color Windows 7 logo. I tried again in Safe Mode, and it got stuck after displaying Loaded CLASSPNP.SYS. I looked in the forums and it appears that the problem is an incompatibility between rEFInd and Windows 7 for x64.

Finally I removed rEFInd, by doing

$ sudo rm -r /EFI/refind

I used gdisk again to check and fix the partition tables in GPT and MBR, and I changed the GPT partition type from 8300 (Linux) to 0700 (Microsoft), using the command 't' from the main menu (maybe it could have been done in GPartEd...).

Once in Windows I did immediately a chkdsk on the repaired HD and everything was fine.

Hope this may be of some help...

hi There

im running yosemite now and i dont see any grey triangle that we can drag to change the size of the partition. already using administrator.

Any idea how to do?

thanks

Then I would suggest that you start your own thread in the Yosemite forum. This is the Snow Leopard forum.

I have the same error as well, I used the recommended option. However, I can boot into windows without any difficulty. Only problem is, I cannot access my windows files from the MAC side. And I can only boot into windows by restarting and holding the option key. Startup management and tools like bootchamp doesnt recognise my bootcamp partition.

Windows 8.1

MBP 15' Retina Late2014 GT750M running Yosemite 10.10.3

Same problem here with Yosemite and Win 8.1. In 8.1 everything is fine, but the disk utility in OSX shows wrong size and I can't access the windows files.

Last time I used paragon camptune, that worked fine :/

Can you provide more details? I have exactly the same problem. This is how my Disk Utility Partition looks like right now:

I went step by step using the following Link: https://www.youtube.com/watch?v=zhkdOLXT6Eg

and installing a program called Mini Tool on my Boot Camp partition on Windows 8.1.

Watch my other thread, I solved it.

These free solutions work: http://macdrug.com/resize-bootcamp-partition-mac-os-x-el-capitan/