A single 3Gb/sec device drops the speed of all devices with most expanders.
off topic but that's why I roll my eyes whenever I read someone complaining that a SATA-III 6G interface on newer harddisks like the Hitachi 5k3000 must be a "marketing gimmick" because spinning disks can't even saturate SATA-II. they miss the point that spinning disks with a 6G interface allow you to not have to separate them from other 6G devices on a bus, like SSD's. that and the whole consumer storage market is transitioning to 6G host interfaces anyway.
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