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I have a HFS-partiion, a bootcamp partition and 100GB free unpartitioned space "in between". How can I resize my Mac partition to use it? All resizing controls seem to be disabled, here's the screenshot:

disk utility with partition selected

Guess I need some more advanced tool than the built-in Disk Utility?

diskutil list results

This is under OSX 10.7.5. With Paragon NTFS driver installed, if this matters...

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Does diskutil list show two or three partitions larger than a GB? You might be stuck backing up and restoring BOOTCAMP if the resize is more important than that partition. – bmike Feb 26 '13 at 13:34
Don't you need to select a partition to be able to resize it – Mark Feb 26 '13 at 13:48
I did select it, of course. Still nothing: – jitbit Feb 26 '13 at 15:26
@bmike diskutil list shows this: – jitbit Feb 26 '13 at 15:27
Could you add a screenshot of this dialog when the middle partition is selected? – Rabskatran Feb 26 '13 at 15:39

Disk Utility won't touch things once you have a BOOTCAMP partition.

Look for third party utilities like CampTune for on the fly adjustments (or at least ones after a reboot in some cases). You'll discover the same company Paragon that made the NTFS drivers, also makes CampTune

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