SAS: Serial Attached SCSI
Serial Attached SCSI (SAS) is a data transfer technology designed to move data to and from computer storage devices such as hard drives and tape drives. It is a point-to-point serial protocol that replaces the parallel SCSI bus technology, and uses the standard SCSI command set. At present it is slightly slower than the final parallel SCSI implementation, but in 2009 it will double its present speed to 6 Gbit/s, allowing for much higher speed data transfers than previously available. It is 'downwards-compatible' with second generation SATA drives. (SATA 3.0 Gbit/s drives may be connected to SAS backplanes, but not vice-versa.)
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