The CalDigit HDPro2 is the most innovative eight drive hardware RAID solution around with support for 8 SATA-II 3Gbs or super fast SAS drive modules. The HDPro2. provides hardware RAID 0 1 5 6 and JBOD support using the next generation RAID engine accompanied by high speed upgradeable ECC cache. The HDPro2 features. Active Sustained Transfer Technology (ASTT) which ensures that there is always a constant throughput. Ideal for massive files like uncompressed HD 2K or even 4K. workflows. The modular design of the HDPro2 allows for 8 hot swappable drive modules. It features an optional hot swappable load bearing power supply 2 hot. swappable ambient temperature controlled and low noise smart fans. Even the built-in controller is removable/upgradeable. the HDPro2 is ready to use right out of the. box. CalDigit builds all major components of the HDPro2 and uses only high quality certified hard drives to provide users with the best possible experience. The key to. the blazing fast speed of the HDPro2 is the direct connect external PCIe connection. The other advantage of this technology is that the HDPro2 can be used on laptops. with ExpressCard/34 slots. The HDPro2 is designed to run 24/7 with no downtime.