600gb 25 inch serial attached scsi sas sff 6g dual port hot plug 10k hard drive in hp hot plug hard drive tray as pictured for g1 g7 proliant sas servers serial attached scsi sas is the logical evolution of scsi combining its long established software advantage with the sas electrical and physical connection with enterprise storage requirements escalating and becoming more complex factors such as larger capacity greater density security scalability and accessibility are more critical