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You cannot repartition the disk from which you booted your computer. Fortunately, iPartition has a “Create Boot Disk” option (under the iPartition menu) that you can use with a Flash stick to make a bootable Flash drive you can boot from. Alternatively, you can use an external disk on which you’ve installed a copy of Mac OS X.
Posted by alastair at 2016-Apr-25 13:04:32 UTC.