Expand vmware Mac OS disk

1. Expand disk size in vm setting, say to 60GB
2. Inside mac os guest, open disk utility 
3. Select  容器->My29GB - Data. (not My29GB)
4. click 分割 tab 
5. Keyin new size in 大小. The size should be less than 60GB as in step 1. 
6. click 套用
7. Done