HP-UX 11.23 mount: cdfs : Invalid argument" Error While Mounting a CD-ROM

While trying to mount the DVD on HP-UX 11.23 , we got the below error.

#mount /dev/dsk/c0t0d0 /cdrom  
mount: cannot access -specific mount command

#mount -F cdfs -o cdcase /dev/dsk/c0t0d0 /cdrom  
mount: cdfs : Invalid argument  

The DVD drive is claimed and online in the ioscan output.Other DVDs have been tried as well, but with the same results.

To resolve the issue, the cdfs kernel module was checked and found that the module was not loaded.

#kcmodule -B cdfs=loaded   

After loading the cdfs kernel module .The DVD was successfully mounted.