LOCKERSTOR 4RD The ASUSTOR LOCKERSTOR 4RD AS6504RD is a 4-bay, 1U rackmount NAS system designed for centralized data storage, management, and backup in small and medium-sized businesses. Featuring an Intel Atom C3538 quad-core processor, 8 GB of expandable DDR4 RAM, four Ethernet ports, and a redundant power supply, it is suitable for use as network storage, a backup destination, and a storage solution for virtualized environments.