dvdwriter - icybox - usb problem

[Guido Van Hoecke]

I have to connect my Plextor PX-716A dvd-writer via an external 
IDE-to-USB/1394 Icybox (IB-550UE-B-BL) to my freebsd-6.0-RELEASE pc. 
This pc is an IBuddy Desknote A928 without room for internal extra 
devices. So I bought an Icybox enclosure, put the plextor in it and 
connected the icybox through USB:

umass0: vendor 0x0402 USB 2.0 Storage Device, rev 2.00/1.05, addr 2
da0 at umass-sim0 bus 0 target 0 lun 0
da0: <USB 2.0 Storage Device 0111> Fixed Direct Access SCSI-0 device
da0: 40.000MB/s transfers
da0: 0MB (1 0 byte sectors: 0H 0S/T 0C)

guivho at wodan:~> sudo cdrecord -scanbus
Cdrecord-Clone 2.01 (i386-unknown-freebsd6.0) Copyright (C) 1995-2004 
Jörg Schilling
Using libscg version 'schily-0.8'.
...
scsibus3:
	3,0,0	300) 'USB 2.0 ' 'Storage Device  ' '0111' Disk
...
guivho at wodan:~>

How do I tell FreeBSD that this is a DVD-writer rather than a hard disk?