Serial Attached SCSI is the future version of SCSI.
It will connect via a serial interface and thus use cables much more compact then "normal" parallel SCSI which leading to better airflow.
At launch, expected to be in the first half of 2004, the speed will be 3 Gbits/sec.
SAS will support up to 128 devices and a maximum cable length of 6 metres.
SAS host controllers will also be able to be used for attaching SATA (Serial-ATA) devices.