The multi-purpose TR Series expansion enclosure features two/four 3.5-inch SATA drive bays, supports multiple RAID configuration options, and provides USB 3.1 Type C (TR-002) or USB 3.0 Type-C (TR-004 & TR-004U) connectivity for use with a QNAP NAS or PC as a hardware-based RAID storage expansion unit or a DAS (Direct-attached Storage) device.