Sans Digital 24-Bay 6G RAID Storage Rack Mount (KT-ES424X6+BSHG) Supports 6G SAS and 6G SATA Technology - Supports both latest 6G SAS and SATA Drives. High Performance PCIe 2.0 x8 RAID controller card - Package includes a PCIe 2.0 x8 RAID-on-Chip RAID controller, supporting up to RAID 5/6/50. Superior Performance - With support of SATA 6G or SAS 6G hard drives and 24Gbps of data bandwidth, performance can reach over 1000MB/s in Read and Write. Advance Feature Included - Hot-Spare hard drive, Auto-rebuilding, Online RAID Migration, Online Capacity Expansion are supported. Staggering Spin-Up - Built-in staggering spin-up for hard drives during power up, thus extending the life / duty cycle of the hard drives and power supply. Scalability - Supports up to 5 enclosures or up to 120 hard drives daisy-chained together for capacity expansion. Multi-purposes - Supports both SAS (Serial SCSI) and SATA hard drives to meet the requirements of different applications with different price/performance characteristics. Optional Redundant Power Supply - Optional hot-swappable, redundant power is useful for protection against power failures.