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.


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.


In the VM Hardware panel, click Edit Settings.


Click Virtual Hardware.


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

The disk type is displayed in the Disk Provisioning field.


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.