I am attempting to increase the size of a thick virtual disk, however the Provisioned Size field in the Virtual Machine Properties screen is greyed out. This is not the case with the other guests on the host. I have one other guest with the same issue, and both of these have a disk file for Hard Disk1 in the format [STORENAME] SERVERNAME/SERVERNAME-000001.vmdk. All other guests have disk files for Hard Disk1 in the format [STORENAME] SERVERNAME/SERVERNAME.vmdk. I would prefer to increase the size without an outage.