there is a third technology besides u3 and castella: www.udrw.com
on a chinese page i found a tool, possibly for this kind of usb-drives, but you need a login-password, to change something. maybe, someone will be able to find a way/hack.
EDIT: on a dutch forum i found a link to: http://www.ao-lab.com/support.html where "UFDUtility v3.2.3.0" is downloadable (grab the manual too), witch is able to manipulate this drives, based on UT163/165 controllerchip.
with this tool i have removed the cdrom-drive (read manual '3.4.3 Restore To Default Setting' page 23-26) and set up a new one with my own data.
UDRW.rar
