I'm trying to retrieve data from some old magneto-optical disks that were originally recorded (I think - this was before my time here) on a Sun workstation that is no longer with us. I'm working with redhat 6.1, kernel 2.4.18-3smp (that's the output of uname -r). I plugged the external optical disk drive into the scsi port and rebooted, and now when I do cat /proc/scsi/scsi, I see a new entry for the "optical device":
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: QUANTUM Model: QM39100TD-SW Rev: N1B0
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 01 Lun: 00
Vendor: Maxoptix Model: T4-2600 Rev: B144
Type: Optical Device ANSI SCSI revision: 02

My problem is with mounting the disks, because I don't know what file system is used on the disks (jfs?), and I *really* don't know which device I'm supposed to specify. I've tried various combinations of:
mount -t autofs /dev/sg* /mnt/opt
mount -t jfs /dev/sda /mnt/opt
etc., and I get either a "/dev/sg0 is not a [valid] block device" or this error:
"mount: wrong fs type, bad option, bad superblock on /dev/sdb,
or too many mounted file systems"

My system currently looks like this:
# cat /etc/mtab
/dev/sda1 / ext2 rw 0 0
proc /proc proc rw 0 0
none /dev/shm tmpfs rw 0 0
none /dev/pts devpts rw,gid=5,mode=620 0 0
/dev/sda3 /home ext2 rw 0 0
/dev/hdb5 /data ext2 rw 0 0

Thanks in advance,
matt