At least a method and system of automatically expanding storage capacity in a data storage device are presented. In one method, the data storage device receives additional hard disk drives. Next, the data storage device receives an expansion option from a user by way of a user interface. The data storage device allocates one or more portions of one or more hard disk drives within the storage device, for use by one or more data pools, based on the expansion option. In one system for automatically expanding storage capacity in a data storage device, the system comprises a memory, one or more processors, and one or more software. One or more data pools are generated using one or more hard disk drives added to the data storage device.