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SAS(Serial Attached SCSI), or Serial Attached SCSI, is a new generation of SCSI technology. Just like the popular Serial ATA(SATA) hard disks nowadays, it adopts serial technology to achieve better transmission speed and improve internal space by shortening the connection cables, etc. SAS is a brand-new interface developed after the parallel SCSI interface. This interface is designed to enhance the performance, availability and scalability of the storage system, and to provide compatibility with SATA hard drives.
The interface technology of SAS can be backward compatible with SATA. Specifically, the compatibility between the two is mainly reflected in the compatibility of the physical layer and the protocol layer. At the physical layer, the SAS interface and the SATA interface are fully compatible. SATA hard disks can be directly used in the SAS environment. In terms of interface standards, SATA is a sub-standard of SAS, so SAS controllers can directly control SATA hard disks. H
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