Plugged into my Apple Mac Pro it has performed well. The only caveat -- you must be careful to select the correct card slot. It will not work in all the slots. Depending on the model of your Apple, you may have to use slot 3. Once installed, it was performed flawlessly. To provide an estimate of speed: I transfered 320 MB of files from an external SATA disk. By USB 2.0 it took over four hours. With the eSATA connection, approximately 45 MINUTES!
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