there isn't anything "robbing you of speed" here, both of those figures are great for external storage devices
the honest to god truth is that even the fancy SATAII/NCQ/16MB (or 32MB) cache drives with all of the latest features and what not
will still only sustain around 65-80MB/s throughput, just due to the physical limitation of their rotational speed and a few other factors
just because the interface specifies a certain speed, doesn't mean the device can, or has to, run at that speed
Wikipedia says SATA 3.0 Gbits/s should provide speeds of 300 MBytes/sec.
The most I'm seeing with HD Tach (freeware benchmark program) is about 212 MBytes/sec (burst speed) for my External ACOMData 1 TB drive. Ironically, that drive claims it only supports 1.5 Gbits/sec max (or 150 MBytes/sec). Whereas my External WD MyBook Home Edition 1 TB only gets up to about 144 MBytes/sec (burst speed), and that drive says it supports 3.0 Gbits/sec max. I'm running a SATA to eSATA cable directly off my motherboard (brand new ASUS, supports SATA 3.0 Gbits/s. Anything I can do to improve my speeds? I'm running a brand new QuadCore AMD 2.2 Ghz so I don't think that's the problem (3 GB DDR2 RAM). Windows XP Pro. I'm also not running any extra software or programs in the background which might impact the benchmarks. Thanks.