So I recently bought a 500Gb drive to use with Time Machine, however, rather than making my life simpler, it's instead caused me considerable stress. I can't tell if it's a bug with Leopard and Time Machine, or if it just doesn't play well with my USB hub, or what. I partitioned it into two separate partitions (both HFS+), one for Time Machine (and other back-up) and one for general use. I attach it to my MBP using a small cheap ($16; cheap for Japan anyway) USB hub (which I also use with my iPod without a problem). When I connect it, it's recognized without a problem and Time Machine updates all its files and all that. The activity light goes on and I can hear it seeking. After a while it quiets down and the light usually goes off. Sometimes however, the light will come back on while the drive remains silent and this is where the problems start. If I try to shut down or restart my computer when the "activity light" is on, my MBP will quit all applications but hang right before shutting down completely. It will sit there (and if I try and click or bring up a dialog with Apple+Option+Esc) and sometimes just beachball without a single indication of what's happening. I haven't waited it out to see if it will go away, but when it hangs for 5+ its a problem. To fix it I have to unplug the drive (which sometimes throws up the don't unplug non-ejected drives! error) in order to have the computer finally finish shutting itself down. I haven't lost any data this way I don't think and I'm pretty sure the OS isn't actually writing anything to the drive (since I can't hear it seeking at all) at this time. Additionally, I've also had the Finder hang (and fail to relaunch) several times after waking the computer from sleep. The HD displays the same behavior then also. Is this a bug with Time Machine? Does it not play nice with partitioned drives? Is the USB hub the problem? (I haven't tried to see if I can replicate this bug when the HD is plugged directly into the computer, but I'll post the results of that later) Is this a Leopard bug? Is it the HD? Is there any way to test it for defects? Further: Does it matter if Time Machine is on a partition where other data exists? Or should I keep a separate partition for Time Machine like I'm doing now?