can not mount video dvd, freebsd6

[Dave]

Hello,
    I've got a FreeBSD6 machine with a dvd drive. I've got a dvd and have to 
make a copy of it. I'm trying to mount it so i can then use dvd+rw-tools to 
make an iso and then burn that to another dvd. I'm getting an error: "File 
exists" when i atempt to mount the dvd. Here's the error and my config:

#dmesg -a|grep cd1
acd1: DMA limited to UDMA33, device found non-ATA66 cable
acd1: DVDR <LITE-ON DVDRW SOHW-1633S/BS0K> at ata1-slave UDMA33
cd1 at ata1 bus 0 target 1 lun 0
cd1: <LITE-ON DVDRW SOHW-1633S BS0K> Removable CD-ROM SCSI-0 device
cd1: 33.000MB/s transfers
cd1: cd present [2275040 x 2048 byte records]
#mount /cdrom1
mount_cd9660: /dev/acd1: File exists
#cat /etc/fstab
# Device  Mountpoint FStype Options  Dump Pass#
/dev/mirror/gm0s1b  none  swap sw  0 0
/dev/mirror/gm0s1a  /  ufs rw  1 1
/dev/mirror/gm0s1f  /home  ufs rw,nodev,nosuid  2 2
/dev/mirror/gm0s1d  /usr  ufs rw  2 2
/dev/mirror/gm0s1e  /var  ufs rw  2 2
/dev/acd0  /cdrom  cd9660 ro,noauto 0 0
/dev/acd1  /cdrom1  cd9660 ro,noauto 0 0
/dev/ad4s1  /backup  ufs rw  2 2
/dev/fd0     /a         msdos    rw,noauto,longnames 0   0

I'd appreciate any help. I do not see any information in /var/log/messages 
regarding this error. I have thought about trying another filesystem type in 
the mount command such as udf, but this is a video dvd and i was under the 
impression that video dvds were iso9660 images.
Thanks.
Dave.