okleydoke, i have a superwhiz unix administrator mate, who has mapped the usb thing to make the system see it as scsi. the problem with having such a mate is that i don't know what he did to my computer by the way!
Anyway, it has got to the point where his linux machine can read from my cdrw drive (the usb one) but not write to it. My machine can only ping the usb drive and eject it et cetera, but can't even read from the drive, let alone write to it. no idea why.
well, i am stuck, and may not come back to this problem for a while. if and when i do though, i'll post my solution here, unless somebody else has a solution to post here first that is...