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I remember very clearly back when I formatted the drive, that I chose everything that St. Steve prescribed me to, GPT table, HFS+ partitions, even though other platforms can't write to HFS+.

Now, surprise surprise, a year later when I have to partition the drive, Disk Utility says "This partition can't be modified", and diskutil(8) says "Volume format does not support resizing".

It's not encrypted, there shouldn't be anything in the way.

/dev/disk3
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *3.0 TB     disk3
   1:                        EFI EFI                     314.6 MB   disk3s1
   2:                  Apple_HFS Nemo                    3.0 TB     disk3s2

Unable to Resize Partitions talks in depth about resizing corestorage, which is irrelevant here.

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    Interesting point, I've just erased all partitions and started over, and I noticed that they couldn't be resized either after being ejected. However, if I plug the disk back in without unmounting the partitions, they seem resizable. So it might be just because I had the healthy habit under Linux to unmount my partitions before fiddling with them.
    – Jonathan Allard
    Commented May 27, 2015 at 19:19
  • hmm. Odd if true. Apple's disk management tools are bad enough, that I'd believe just about anything.
    – William T Froggard
    Commented May 27, 2015 at 19:42
  • @JonathanAllard, Extraordinary, but true. This just solved my problem. Thanks! (If you write this as an answer, I'll vote for it :-) )
    – Neil Mayhew
    Commented Mar 4, 2017 at 23:59

2 Answers 2

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(Originally posted as a comment)

Interesting point, I've just erased all partitions and started over, and I noticed that they couldn't be resized after being ejected. However, if I plug the disk back in without unmounting the partitions, they seem resizable.

So it might be just because I had the healthy habit under Linux to unmount my partitions before fiddling with them.

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  1. I just removed my external drive.
  2. connected it with another Mac device "with newer os".
  3. Entered disk utility and now it is resizable!
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