Not sure which formats this will work with, I assume FAT32 will also work, but I had prepared a flash drive with Ubuntu 10.10 on it, ready to install from USB on my PC, and thought I would plug it into the USB HOST port of the scroll with the little USB adapter extension lead, and it worked.
It mounts its as a SCSI drive, and I could explore it through a file explorer through: /scsi
So there we have another way to move things to and from the scroll
I wonder what else will work via USB HOST