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And last plug the eSATA cable into the rear of the unit just like this:

That's it you're done and ready to use you're new eSATA drive. Just turn on the MB559US-1S first and boot up your system. Windows XP will just think you have a new SATA drive installed and you can treat it exactly like an internal SATA drive. Yes if you want you can even make this your Boot drive. Also you can unplug the eSATA cable while the computer is running and plug it back in without harming the Hard Drive or the computer. Windows XP will redetect the drive again just like when using the unit in USB mode, that's right this thing is really "Hot Swappable".

Now for the benchmark test using SiSoftware Sandra to test the drive performance. The tests were done with the ICY DOCK MB559US-1S used in USB and eSATA modes. Then the Seagate SATA drive was removed and hooked to the computer directly as an internal SATA drive. Lastly a Western Digital Internal IDE ATA 100 drive was benchmarked to compare it to the other tests.

Drive Index :
Results Interpretation : Higher index values are better.

Random Access Time :
Results Interpretation : Lower index values are better.

As we can see from the test the eSATA and internal SATA test are exactly the same. No difference in speed. But the USB test shows a huge drop in performance not even coming close the the IDE ATA 100 drive. SATA and eSATA were also faster then the IDE drive as expected so if you're using the ICY DOCK MB559US-1S in eSATA mode you will have all the data transfer speed you need for what ever you're using it for. USB speeds are still fast enough to make this a usable option for moving data from one computer to another but it will not be useful for things like video editing were you need the drive to have a fast data read and write speed.