Serial Attached SCSI

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SAS

Serial Attached SCSI
SAS connector
Width in bits	1
No. of devices	65,535
Speed	SAS-1: Full-duplex[1] 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)[2]
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, solid-state drives and tape drives. SAS replaces the older Parallel SCSI (Parallel Small Computer System Interface, usually pronounced "scuzzy" ^[3][4]) 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.^[5]

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.