You can determine whether your virtual disk is in thick or thin format.
If you have thin provisioned disks, you can change them to thick by selecting Flat pre-initialized disk provisioning. You change thick provisioned disks to thin by selecting Allocate and commit space on demand.
- Right-click a virtual machine in the inventory and select Edit Settings.
- On the Virtual Hardware tab, expand Hard disk.
The disk type is displayed in the Disk Provisioning field.
- Click OK.
What to do next
If your virtual disk is in the thin format, you can inflate it to its full size using the vSphere Web Client.