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Why is SATA simplex even though it has separate TX+/- and RX+/- pairs? Why can't it be full-duplex like SAS (which has the same interface with multiple ports and is full-duplex). If I am wrong with this concept please correct me.

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  • \$\begingroup\$ Unsure if this question is on topic here. \$\endgroup\$
    – jippie
    Commented Aug 16, 2013 at 6:09

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For backward compatibility with PATA/ATA/ISA, SATA uses the PATA/ATA/ISA command set. PATA/ATA/ISA is simplex because it is a connector to the ATA/ISA/PC/XT bus which is simplex. The ATA/ISA/PC/XT bus was simplex because it was a connector to the 8086/8088/80286 processor data bus, which was simplex.

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