☆ Product Name: DAS, External RAID Storage ☆ Model Number: Pegasus2 R4 ☆ HDD: HDD or SSD, 3.5/2.5 inch compatible ☆ System Requirements: Mac or Windows computer with Thunderbolt 2 port. ☆ Interface: Thunderbolt 2 technology port (20Gbps) ☆ Included: Main unit, AC cable This is a DAS (Direct Attached Storage) from PROMISE TECHNOLOGY. (External HDD) You can create a RAID with up to 4 HDDs or SSDs to store data. You can safely store data by effectively utilizing HDDs that you don't use much by combining them in sets of 4. This product uses Thunderbolt 2 technology. It cannot be used with USB. It can be used with Mac and Windows models equipped with Thunderbolt. The speed is 20Gb/s, which is 4 times faster than USB 3.0 (5Gb/s) and 2 times faster than USB 3.1 Gen 2 (10Gb/s). *Theoretical value. 3.5/2.5 inch HDDs can be used, and it can hold 4 disks. RAID levels 0, 1, 5, 6, and 10 are supported. Drivers can be downloaded from the manufacturer's website. ☆ Condition: Operation confirmed. Please purchase if you understand that this is a used item.