Previously, when adding a new data storage domain without stating the values of Discard After Delete (DAD) and storage format, their default values were previously calculated according to the data center version of the host that added the storage domain. Discard After Delete was set to true for a data center greater than or equal to Red Hat Virtualization 4.1, otherwise it was set to false. The storage format was set V4 for the a data center greater than or equal to Red Hat Virtualization 4.1, otherwise it was set to V3. This was a bad heuristic since the data center of the host that added the domain is a random data center and it is not necessarily the data center that the domain will be later attached to. Now, the logic has been changed so that the default storage format for new data domains will be the latest format, currently it is V4. For non-data domains, nothing has changed V1 was and will remain the default value. The default value of Discard After Delete will be calculated according to the storage format and is set to true for storage formats greater than or equal to V4, otherwise it is set to false.