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I'm trying to create a partition in following "Part 2: Preparing your Mac" from this website. I have to create "Ubuntu Boot Loader" in selecting the principal hard drive "APPLE SSD AP0512J Media", select Partition -> + -> Name : Ubuntu Boot Loader -> Format : Mac OS Extended (Journaled) -> Size: 128 MB, but I got the following error with Disk Utility :

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I got the following message when I hit "Show Details" :

Running operation 1 of 1… Checking prerequisites for resizing Logical-Physical volume stack The requested size change for the target disk or a related disk is too small. Please try a different disk or partition, or make a larger change. Operation failed…

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Could anyone be able to tell what do I have to do to fix the "Operation failed"?

Sandra Ross
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  • Glad things are sorted out. Dug this answer up just now - http://apple.stackexchange.com/questions/240326/unable-to-erase-reformat-or-repartition-usb-drive – bmike Dec 05 '16 at 02:54
  • Tip: you might not be creating a real gpt partition but a logical partition using corestorage. – John Keates Dec 05 '16 at 03:33

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Like it says in the error box, try making a bigger partition. The partition you are trying to create is only 128 mb. Even though it says create a 128MB partition(in the guide), it wouldn't cause any problems to increase the size of the partition since there are errors for creating a partition of the size 128MB.

airsquared
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