I bought a MacAlly GS350SUAB hard drive enclosure for the firewire 800 port. Before I made the purchase, I looked around for some FW800 drive xbench scores and found a few results: http://www.mcelhearn.com/2009/07/19...l-hard-disk-speed-comparisons-and-benchmarks/ http://www.mymac.com/showarticle.php?id=652 http://discussions.apple.com/thread.jspa?messageID=10652532 http://www.chipchick.com/2008/09/seagate_freeagent_desk_drive_mac.html?pid=839 When I ran the xBench disk test on my drive, I was unimpressed. They weren't much better than when I plugged it in using the USB port. Uncached Write 34.81 MB/sec [4K blocks] Uncached Write 43.62 MB/sec [256K blocks] Uncached Read 18.11 MB/sec [4K blocks] Uncached Read 46.06 MB/sec [256K blocks] I thought maybe xBench was sucking, so I timed how long it took to write a 831MB file to the drive using both USB and FW800, and it was actually faster (marginally) on USB. FW800 took 30 seconds, while USB took 28. Something doesn't seem right. Does anyone have any thoughts on why this could be? I do have a FW400 audio interface hooked up, but that is of course plugged in to the FW400 port and shouldn't make a difference. The hard drive I'm using came out of a Seagate FreeAgent. Is it possible it's just a really slow drive?