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Disk Utility will NOT resize partition in El Capitan

I spent the last hour trying to resize a partition, only to have El Capitan's disk utility tell me it succeeded while actually doing NOTHING.


I first started to try and resize a partition which I just plain couldn't. I ended up learning that Disk Utility will MIS-report that the partition can't be resized because Journaling wasn't enabled.


In that regard the REAL problem was that the partitions were not mounted, as when they were these warnings disappeared (only to come back if I tried to unmount one of the partitions again).


So I've already identified that Disk Utility cannot tell the difference between a partition that is unmounted and a partition that doesn't have journaling enabled -- two things which are no where near the same thing.


So, moving on, I finally stopped trying to resize one of my partitions as in spite of it not telling me why, it simply will NOT allow me to resize the first partition on the disk. I cannot drag the round handles shown on the pie graph, and manually typing any new number in the size box was useless because Apply was disabled.


At this point in time I decided I would image the second drive and delete the first partition. I give up on this quickly because thought it will let me format the first partition, in addition to not letting me resize it for unknown reason it also will not let me delete the partition so I can create a new one in the right size. I managed to reformat this partition several times, but this ultimately led nowhere.


Now here is what I actually am looking for some help on...


The second partition cannot be resized either, but not for the same reasons the first partition cannot be resized. You see, I managed to adjust the side, click apply and have Disk Utility go though the process of resizing, only to finally re-mount the volume at the EXACT SAME SIZE it started at, and then report to me that it was "successful".


I did this multiple times, each time begin told the partition was resized successfully, and each time ending up with a partition of the EXACT SAME SIZE as when it started...


Anybody know how to get Disk Utility to actually do the resizing when it says resize?

Posted on Sep 30, 2015 8:22 PM

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18 replies

May 9, 2016 4:35 AM in response to Bobby T

Heya all!


so have we found any solution to this problem? I'm trying to resize the timemachine partition in an external drive and its saying, because its not journaled it cannot resize and that if i want to enable resizing, i should enable journaling from the file menu. though im worried that i might lose all my data on the drive.


any ideas?

Disk Utility will NOT resize partition in El Capitan

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