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.

1

Select a virtual machine.

In the virtual machines and templates inventory tree, select a group of virtual machines and select a virtual machine from the list on the right.

Search for a virtual machine and select it from the search results list.

2

In the VM Hardware panel, click Edit Settings.

3

Click Virtual Hardware.

4

Click the triangle next to the virtual disk to expand the disk options.

The disk type is displayed in the Disk Provisioning field.

5

Click OK.

If your virtual disk is in the thin format, you can inflate it to its full size using the vSphere Client. See the vSphere Client online Help.