Sans Digital EliteSTOR 4U 24 Bay SAS/SATA to SAS JBOD with SAS Expander Rackmount ES424X+B (Black) SAS Expander Technology - Connect 8 SAS or SATA drives with only a single cable to eliminate point of failure SAS controller is required Staggering Spin-Up - Built-in staggering spin-up for hard drives during power up, extending the life / duty cycle of the hard drives and power supply Utilizes industry standard Serial General Purpose Input/Output (SGPIO) to provide the hard drives status Hard drives activity and fail status can transfer using the mini-SAS connection cable, so that no extra cable is needed Scalability - Supports up to 7 enclosures 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