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I've read a few of the articles around, browsed the net for a while, but was unable to find a solution to my problem.

I have an MBP with 1TB Flash which is split by 50% into two partitions. One contains OS X, the other is used for raw data storage.

Now what i would like to do, is create a third partition from some of the remaining space on the 1st (OS X) partition. Essentially, i need to "fill in" a third partition in between the two existing, but without affecting the capacity of partition #2.

I remember that back in the days when i installed Bootcamp it seemed no problem to change my main partition size and add an extra partition, but for whatever reasons, i cannot do that. Disk Utility has completely greyed out all the controls:

Screen

I also tried rebooting from a Mavericks USB-Installer Stick and then going to Disk Utility in there, but the result is the same. I hoped it would work there because OS X was not in use - but no.

Why is that? Has it become impossible to repartition a drive in use? Or have i generally misunderstood something here?

(MBP Mid 2014 | 1TB | Yosemite OS X)

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1 TB? I presume that's a Fusion drive. Fusion drive can at most have 2 partitions.

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  • Fusion? Never heard of it. What is that? Hardware Info says it is an APPLE SSD SM1024F Media and states Revertible: Yes on the Logical Volume.
    – SQRCAT
    Commented Oct 24, 2014 at 17:07

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