burncd: "device busy" error when writing .iso

[Jason Morgan]

I am attempting to burn an .iso of the 5.3 mini distribution and keep 
running into the following error:

# burncd -f /dev/acd0 data 5.3-RELEASE-i386-miniinst.iso fixate
next writeable LBA 0
writing from file 5.3-RELEASE-i386-miniinst.iso size 274400 KB
written this track 640 KB (0%) total 640 KB
only wrote -1 of 32768 bytes: Device busy

fixating CD, please wait..

I have verified that the drive is working and is accessible.  I have 
tried different media and keep running into the same result.

# dmesg | grep acd0
acd0: DVDR <PIONEER DVD-RW DVR-108> at ata1-master PIO4

This is a new drive, that I just recently installed.

Oh, I'm running FreeBSD 5.2.1-RELEASE-p11 #7.

Any suggestions?  I've only burned CDs with FreeBSD a few times and 
never on this system, so I'm kinda a newb.

Thanks for your time.