I borrowed a friends WD Passport 2.5" drive, that came with a separate power supply. I ran that off an inverter, and hooked it up. The drive was 250GB, formatted FAT32, with about 100GB of music.
Results? It worked. But it was WAAAY slow. The results from BorisM (5-10 minutes to load) were accurate. It took forever, and the responsiveness of the unit was such that it was almost unusable. If it had worked I would have bought one the next day...as it is, I'll pass.
But these Trekstor drives look very interesting. It looks like they don't experience the same problems with the slow