You can determine whether your virtual disk is in thick or thin format.
- In the vSphere Client inventory, right-click the virtual machine and select Edit Settings.
- Click the Hardware tab and select the appropriate hard disk in the Hardware list.
The Disk Provisioning section on the right shows the type of your virtual disk.
- Click OK.
What to do next
If your virtual disk is in the thin format, you can inflate it to its full size.