Here's some more data: I'm running knoppix 6.4. I just tried to plug in another external drive -- an IOMEGA 1TB which is formatted for a PC (probably NTFS, I'm not sure). Knoppix doesn't see that disk at all! I know that it's plugged in properly because it has a built in USB hub, and when I plug another harddisk into that (it's a small Seagate) Knoppix immediately mounts that as R/W. I'm really puzzled.