Thought I would pass this along since I had trouble with my first e-sata card . My Caldigit just came in and installed the firmware and it is working fine. You can't boot from it though But I do have it hooked up to a 7200 32mg cache WD 640 drive and the reads and writes are around 100mgs/per second each way. Here is a link to one there not cheap but they work and that is good enough for me and faster than Firewire 800
http://eshop.macsales.com/item/CalDigit/FASTA1EXOB/
http://eshop.macsales.com/item/CalDigit/FASTA1EXOB/