can we like connect an external drive for a 9210, like for example a cd-rom drive, or a multimedia card drive using the cable?
external drives
Nah~
GPS device may do!
No, although as I understand it there is support in the OS for such a thing, which is more than can be said for most PDA / Phone OS's.
Rafe
scary thought is that this is faesibly possible, *but* at a data rate of 115kbps, it'll do a floppy drive or a 1/15th speed CD drive (C; So it's not worth it really.
When I connect to my notebook that is in some ways, nothing more than a glorified external disk 
hmmmm.... can we??? i dont think so...