I really feel like I have to dismount the disk and do something with VMDKTOOLS but I can be second guessing myself. Neigh, I'm 2nd guessing myself. Further more, thin provisioning of VMDKs may cause undue contention for I/O means over a datastore, which is an entirely separate dialogue. http://louisgbwqj.educationalimpactblog.com/8643529/about-vmware-reclaim-disk-space-thick-provisioned