Unreadable DVD in FreeBSD and NetBSD

I have a DVD, a data DVD rather than movie or music, from Seagate Business Storage 2-bay NAS, that is mountable with mount_cd9660 but not readable in FreeBSD and NetBSD, using current amd64 versions of FreeBSD and NetBSD.

ls /cdrom showed nothing; ls -al /cdrom showed

total 6
dr-xr-xr-x   2 root  wheel  2048 Nov  1  2012 .
drwxr-xr-x  26 root  wheel  1024 Jul 25 03:31 ..

df showed

Filesystem      1K-blocks     Used     Avail Capacity  Mounted on
/dev/gpt/WD2G04 121863804 52278052  59836648    47%    /
devfs                   1        1         0   100%    /dev
/dev/gpt/WD2G05 142191228  8022016 122793916     6%    /home
/dev/cd0          1832610  1832610         0   100%    /cdrom

so it looked like something was there.

Mounted under Linux (System Rescue CD 4.3.0), main directory showed 

autorun.inf
Rally Driver Installation Instructions
Resources
Seagate EULA
Seagate NAS Backup
Seagate NAS Discovery
Seagate NAS Discovery Install Package
Seagate Privacy Policy
Setup.exe
Windows Driver

Haiku R1Alpha4 (haiku-os.org) was also able to show these directories and read the DVD.

Is there any way I can read this DVD in FreeBSD or NetBSD, or is this a deficiency or bug in FreeBSD and NetBSD?

I tried mount -t udf (no good) and "mount_cd9660 -be /dev/cd0 /cdrom" (same result as without -be).

What more details could I give? 

Tom