The Dell Adaptec ASC-39160 U160 SCSI HBA PCI-X Card Adapter is used for connecting SCSI External Drive enclosures to a host server. It requires an open PCI-X slot in the host server. It has dual 68 pin SCSI channels for attaching External Tape Drives or PowerVaults and Channel A and B for Internal 68 pin Tape Drives. One 50 pin for Ultra SCSI.