In Disk Utility, I can't split my Macintosh HD volume because it says: "This volume can not be split because the resulting volumes would be too small."
Here is what it looks like:
This is my disk:
diskutil list says:
Using newest Macbook Pro and OS 10.13.6.
Anyone know why I can't partition it?
MacBook Pro, macOS High Sierra (10.13.6)
Ok. It took a call to Apple and a bounce to engineering, but I think I have an answer. At least it fixed the issues on my computer, although I cannot understand why this would have created the problem I was experiencing. Apparently Disk Utility would not allow me to partition the internal drive while TimeMachine had a local snapshot.
The fix is relatively easy. In Terminal enter
tmutil listlocalsnapshots /
Once you see the list go ahead and delete them
tmutil thinlocalsnapshots /
That should allow you to partition the drive. On mine when I added the new partition it showed as if I had created two partitions, one the intended partition and then a second unmounted partition of essentially the same size that was formatted with APFS partition store. On restart the second ghost partition was gone and the issue resolved.
Good luck if anyone stumbles across this problem.
Ok. It took a call to Apple and a bounce to engineering, but I think I have an answer. At least it fixed the issues on my computer, although I cannot understand why this would have created the problem I was experiencing. Apparently Disk Utility would not allow me to partition the internal drive while TimeMachine had a local snapshot.
The fix is relatively easy. In Terminal enter
tmutil listlocalsnapshots /
Once you see the list go ahead and delete them
tmutil thinlocalsnapshots /
That should allow you to partition the drive. On mine when I added the new partition it showed as if I had created two partitions, one the intended partition and then a second unmounted partition of essentially the same size that was formatted with APFS partition store. On restart the second ghost partition was gone and the issue resolved.
Good luck if anyone stumbles across this problem.
I also had this issue and the Time Machine snapshot was the culprit. I ran tmutil listlocalsnapshots / to get the date of the last snapshot then I ran tmutil deletelocalsnapshots 2018-09-12-163604 to delete the local snapshot. I went back to Disk Utility and now I can make partitions again. Thanks for sharing and reaching out to support!
If you select a larger size partition, can you partition the disk?
Same issue with a 2018 MacBook Pro. The only difference is it has the smaller internal drive, 256Gb internal with only half used. I have not added a Boot Camp partition so only one partition on the drive currently.
Trying to create a partition for installing Ubuntu as dual boot.
It gives the same message in both Disk Utility regularly and when starting up in recovery. All commands, +, -, name, format, etc are greed out and you cannot drag to adjust. Possible this is an issue just with the newer hardware?
I cannot partition at all, the bootcamp portion has already been partitioned a while ago, and I cannot create any new partitions, nor can I adjust the sizes of any of the existing ones.
Can't split volume because volume would be too small error
