Specifies whether the quota will be the default for the following:
New users or groups that are created after the default entry has taken effect. For example, if the maximum disk space for default user quotas is 500 MB, any new user can use up to 500 MB of disk space.
Users or groups that do not have an explicit quota. For example, if the maximum disk space for default user quotas is 500 MB, users for whom you have not specified a user quota can use up to 500 MB of disk space.