In order to mount hps+ cdroms you must use hpmount with the following

hpmount -rp1 /dev/hdd

Your disk may be in a different drive. I initially tried:

hpmount -rp1 /dev/hdd /mnt/cdrom

But I found out that it will not mount to a dir. You must use hpls
and hpcp to do anything to the drive.

Frank Meyer