HP SAS (Serial Attached SCSI) HDDs (Hard Drives) are high-performance alternatives to SATA hard drives. SAS hard drives combine high-bandwidth and faster data transfer rates with better error detection and recovery, as well as having higher reliability specifications. - Higher hard drive performance compared to typical SATA drives - Higher hard drive reliability compared to typical SATA drives - "Star" topology (point-to-point, no hubs). Each device gets full bus bandwidth.