Reading CDR volume labels from Tru64

Managers,

We have a script which splits vdump backups across multiple CDR's using the 'mkisofs' and 'cdrecord' utilities. This is done using Tru64 5.1b-3 on a DS15 server.

mkisofs is called using parameters to identify a CDR volume in the multi-disk set
i.e. [-V volid] [-volset ID] [-volset-seqno #]

My question is: 
How can I read this volid, volset and volset-seqno data from the burned disks ?

I don't see anything useful from 'disklabel' or 'scu' to report the volume info on an ISO disk.

Any ideas?


thanks.