Single SFF-8643 Mini SAS HD port fans out to four independent SFF-8482 29Pin combined data+power interfaces; Built-in separate SAS 15Pin auxiliary power port for extra stable power supply to high-power SAS/SATA hard drives; Supports SAS 3.0 12Gbps high-speed transmission, compatible with 2.5" / 3.5" SATA HDD & SAS HDD; 1-meter flexible length enables neat wiring layout inside large rack server and spacious chassis; Multi-layer EMI shielding minimizes signal attenuation for stable 24/7 RAID, NAS and JBOD storage operation