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SATA controllers will address the device at the speed it supports, so it would communicate with the DVD drive at the 1.5gb/s rate and the hard drives at the full 3.0gb/s rate.
According to Wikipedia:
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SATA/300's transfer rate is expected to satisfy drive throughput requirements for some time, as the fastest desktop hard disks barely saturate a SATA/150 link. This is why a SATA data cable rated for 1.5 Gbit/s will currently handle second generation, SATA 3.0 Gbit/s sustained and burst data transfers without any loss of performance.
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I did some tests with my own system, using SiSoft Sandra and Everest, and even when burning a CD, the HD (a Sata/300 160gb 7200rpm drive) performance didn't drop off during benchmarking.
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Were the burner and the hard drive on the same SATA cable? The info above does not contradict the info Moonliner posted. A SATA cable/controller may be able to handle a single device that's rated at a higher speed, but that's different than speed negotiating between
multiple devices on the same link. It may not suck all the bandwidth, however it may only be able to handle a single clock rate.