I have a VMware installation, v6.7. I have 3 datastores, one on a server and two on a Drobo. I have one VM where the C drive is in a datastore that is on the Drobo, and the rest of the drives attached to the VM are on the server. I need to bring them together on the server. I have tried copying the vmdk using the web vSphere client but it keeps ending in failure with the message "Failed - A general system error occurred: Invalid change tracker error code". The drive is thick provisioned and there is enough space on the target drive to copy it there. How can I do this?