The HDD interface is ATA100, which is plenty fast for whatever you can do with MorphOS anyways, and for USB... ever heard of USB hubs? :hammer:
The bus is fine, it's the 4800RPM drive that makes it slow. Of course, MorphOS isn't constantly hammering away at the hard drive like Darwin, so I'm sure it's not a problem.
USB hubs are just a nuisance, since they're either not powered and semi-useless, or they are powered and require another power source to be plugged in. I don't need the clutter. Having powered hubs inside of other devices is great though. I wish it were more common.