Caution: Before following these procedures, VMware recommends that you have a valid backup of the virtual machine and enough space to convert the virtual machine's disk(s) from thin to thick.
To change the provisioning of a virtual machine base disk from thin to thick from the Datastore Browser:
Notes:
Alternatively, virtual machine disks can be cloned to create new Thick or Thin provisioned VMDKs. For more information, see Cloning and converting virtual machine disks with vmkfstools (1028042).