There are two partitions currently allocated on my 100 GiB hard disk. However, only ~85GB is formatted and I cannot expand
/dev/disk0s2 to the maximum size with various attempts such as
gpt. The last ~20 GB free space does exist, but it cannot be partitioned.
disk0 is a VMware vmdk resized from 85 GB to 107 GB with vmware-vdiskmanager.
What may cause this? And how should I achieve the goal?