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I currently have this setup on my Mac- OS X Mavericks 10.9.3, Windows (bootcamp) and a Recovery HD.
My question is can I repartition my hard drive to have another partition, using disk utility (resize the OS X part and have a new part created with that space)- disk utility warns me I might get kicked out of Windows booting for doing this, and I want to make sure if that's really going to happen.

Thanks!

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Yes, this is dangerous and uncertain. Just to be safe, and to plan for the worst, expect that all your partitions will be destroyed by the process, and that you may need to reformat your entire hard drive and re-partition it to the new partition scheme that you require, after which you will have to restore your Mac OS X volumes and your Windows Boot Camp partition and restore your Windows installation to that new partition.

You had better make a complete backup of every partition to external hard drives before you do anything. You can use the donation-ware utility Carbon Copy Cloner to clone your existing Mac partitions (Macintosh HD and the hidden Recovery HD) to an external hard drive formatted for Mac OS Extended (Journaled).

You should purchase whatever Windows software is necessary (Symantec Ghost, etc.) to clone your Windows partition while booted into Windows itself. You should clone it to a different external hard drive formatted for Windows NTFS.

Only once you are sure that all your partitions are backed up should you undertake the re-partitioning in Disk Utility. If you are fortunate, everything will go well and you will not need to re-install anything. But since you cannot be sure that this will happen, you would be very wise to have backups of everything first.

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  • thanks for clarifying. another small que- is it possible to install another os x on that 3rd part (say lion or yosemite?)- would that conflict with the current recovery hd? Commented Jun 5, 2014 at 16:35
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    Just to be clear here, Bootcamp not supported on drives with more then three (Bootcamp, OS X, Recovery) partitions. It can be done, but it is difficult and error prone.
    – sdmeyers
    Commented Jun 5, 2014 at 16:45
  • I think that trying to go with two versions of OS X in addition to BootCamp and Windows would probably not work. When you install Lion, Mountain Lion or Mavericks, it wants to create a new hidden, secret Recovery HD. So each Mac OS X is in fact two partitions, not one. Having multiple Recovery HD partitions would be really complicated. There may be a way to get around this, but it may not work. Back up everything to its own hard drive in its own native file format before you try to change anything.
    – user9290
    Commented Jun 5, 2014 at 17:22
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Well, I just repartioned my Mavericks bootdrive to have a second HFS+ partition, and I have a BootCamp partition on the same drive. Worked fine, and I just started my BootCamp partition in Parallels without problem. So it may be possible.

I would take the advice to backup/clone mye partions beforehand. I can recommend WinClone from Twocanoes.com, it worked for me.

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  • Oh, I no longer have a Recovery Partition, I should say.
    – Hans
    Commented Jun 5, 2014 at 20:47
  • Sorry, it didn't work in the sense, that it was not possible to install Yosemite on the new partition without making the BootCamp unbootable (that's what the Installer says). Sorry to have started leading you down this path.
    – Hans
    Commented Jun 5, 2014 at 20:56

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