growisofs: no mkisofs options are permitted with =, aborting

[Hanspeter Roth]

Hello,

I'm trying to burn an iso image onto a DVD+RW. 
I'm trying: 

growisofs -Z /dev/cd0=image.iso

This yields:

growisofs: no mkisofs options are permitted with =, aborting...

`dmesg | grep cd0` is:

acd0: CDRW <HL-DT-ST DVD+RW GCA-4040N/1.15> at ata1-master PIO4
cd0 at ata1 bus 0 target 0 lun 0
cd0: <HL-DT-ST DVD+RW GCA-4040N 1.15> Removable CD-ROM SCSI-0 device 
cd0: 16.000MB/s transfers
cd0: Attempt to query device size failed: NOT READY, Medium not present - tray closed

FreeBSD is 6.0-BETA1. Growisofs is version 5.21 and mkisofs is 2.01
(cdrtools is 2.01).

How can one burn an iso image onto a DVD+RW by growisofs?

-Hanspeter