rsync and removable devices

[Anne Wilson]

I need to keep a directory on the laptop sync-ed with a directory on a usb 
drive.  I can't get rsync to accept the sda1, even though I've tried several 
variations of address in the command.  I must be missing something?

It's mounted normally for a usb drive, under media:/, but that obviously 
doesn't act as a normal directory, since you can't ls it.  Clarification of 
this would be useful, too, for future use.

Thanks

Anne