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Resizing partitions?


gto

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Can't be done from either OS disk utility/disk management tools. These can only reduce  (or increase) a partition size from its end but they cannot move a partition which is what you'd need here. According to what you described, your disk is organised as follows:

  • 1st partition with OS X El Capitan
  • 2nd partition with Windows 10

Partitions cannot be split across separated disk areas so what you effectively need to do here is:

  1. reduce Win10 partition
  2. move reduced Win10 partition to end of disk
  3. recover the space liberated between end of OS X partition and moved/reduced Win10 partition to reallocate to OS X partition

You'll have to look for dedicated 3rd party apps such as GParted, Paragon and many others to do this.

 

The only other alternative would be to make an image of your Win10 installation (or clone the partition) before you delete the 2nd partition from El Capitan Disk Utility app, after which you would be able to re-create a smaller 2nd partition on which you'll restore your Win10 image.

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