Yes I know that. However the issue surrounds the primary datastore. I can create datastores and extents to my hearts content once I have a primary datastore, but the install process doesn't allow you to select a sector size for the format, so even a 1.47Tb primary datastore in this example is useless when it won't allow snapshotting of disks larger than ~200Gb. All I want is the ability to partition approx 20-50Gb for a primary datastore (to contain ISOs etc) and leave me with the rest of the disks to configure how I need.