Be more explicit about disk limit expecations
Be more explicit about disk limit expecations

[#150937076]

Signed-off-by: Sam Smith <03a07629efb0a02c7bbe7cc340a4243da1ab861a@gmail.com>

cloudfoundry/garden-windows,cloudfoundry-incubator/garden-windows,cloudfoundry-incubator/garden-windows,cloudfoundry/garden-windows,cloudfoundry/garden-windows,cloudfoundry-incubator/garden-windows