Cannot resize APFS partition - “The new size must be different than the existing size” I'm trying to use entire 1TB HD as 1 drive. Using the disk utility to resize the disk to 1TB I keep getting "The New size must be different than the existing  size".
I tried using the apple disk utility but got the same thing.

ADDITIONAL INFO I forgot to mention... I did clone a drive that was 256GB on to this 1TB drive... Then I ran the disk utility to repair it.
This helped me:

repair (internal, disk0 - in your case)
diskutil repairdisk disk0

resize (synthesized, disk1 - in your case with HS)
diskutil apfs resizeContainer disk1 0


After repairdisk resizeContainer works with no errors. You can see a similar issue over here for more context: Cannot resize APFS partition - &quot;The new size must be different than the existing size&quot;