Hello All - I've got two WD 500 GB My Book Pro drives and a 1 TB My Book Studio Edition Drive. The issues that I'm having are that when they're all on the FW 800 bus, they'll all mount initially, but one might disappear after a day or two and then I have to restart (unplug) the drive to get it to mount again. So I put one on the FW 400 bus and left the other two on the 800 - same issue - one may disappear from time-to-time. Also - when they're plugged in, more often than not the machine will stall out trying to either start-up or shut down. When I disconnect the drives, the machine then proceeds to either start-up or shut down. Have folks experienced similar issues? Are there some set of Mac OS 10.5 drivers that I should be aware of? The drives are all formatted for the Apple journaled format. Thanks for sharing any solutions that you may have come across.