Cross internal-external conversion: SFF-8643 onboard HD SAS host to external SFF-8644 port for JBOD/DAS enclosures; 60cm moderate length fits mid-tower and rack server routing without excessive slack clutter; Native 12Gbps SAS 3.0 bandwidth, backward compatible with 6Gbps SAS 2.0 for all SAS/SATA storage devices; Multi-layer full EMI shielding + high-purity copper core eliminates signal attenuation and rack electromagnetic crosstalk; Lock-in gold-plated connectors resist long-term fan vibration; compatible with RAID HBA cards, DAS and NVMe storage enclosures