I guess that unpowered hub threw it 1While this issue has been covered fairly well, I thought I'd add my experience the my SP3 and Seagate 1G portable drive. The drive worked fine when it was connected directly to my SP3, but failed when I used an unpowered USB hub. I then used a powered USB hub and it worked perfectly again.
I'll only work sittin' downtown in a railway station...I guess that unpowered hub threw it 1tokemilliamp over the line.