Serial Attached SCSI

SAS
Serial Attached SCSI
	SAS connector
Width in bits	1
No. of devices	65,535
Speed	SAS-1: Full-duplex 3 Gbit/s (2004); SAS-2: Full-duplex 6 Gbit/s (2009); SAS-3: Full-duplex 12 Gbit/s (2013); SAS-4: Full-duplex 22.5 Gbit/s (2017);
Style	Serial
Hotplugging interface	Yes

In computing, Serial Attached SCSI (SAS) is a point-to-point serial protocol that moves data to and from computer-storage devices such as hard disk drives and tape drives. SAS replaces the older Parallel SCSI (Parallel Small Computer System Interface, usually pronounced "scuzzy" or "sexy") bus technology that first appeared in the mid-1980s. SAS, like its predecessor, uses the standard SCSI command set. SAS offers optional compatibility with Serial ATA (SATA), versions 2 and later. This allows the connection of SATA drives to most SAS backplanes or controllers. The reverse, connecting SAS drives to SATA backplanes, is not possible.

The T10 technical committee of the International Committee for Information Technology Standards (INCITS) develops and maintains the SAS protocol; the SCSI Trade Association (SCSITA) promotes the technology.

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