If you wish to allow non-root users to write CDs, you must give them permissions to do so.
1) Give them permissions by setting SUID-root bit on cdrecord:
# dpkg-reconfigure cdrecord
2) Next you need to add your users to the cdrom group. New user rocky can be added as follows:
# adduser rocky
Once user added, add rocky to group cdrom:
# adduser rocky cdrom
3) Since cdrom group has write access to /dev/cdrom (/dev/hdc etc) and we have added user to cdrom group, rocky will be able to write cds.
4) Create an ISO file and write it:
$ mkisofs -v -o my.iso -R /home/rocky/mydata/
$ cdrecord -v -dev=ATA:1,0,0 speed=4 my.iso
Note as the root user you can mount an ISO file to modify or view its contains.
Related: Burning multi session CDs under Linux
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I think adding rocky user to operator group will be enough, I tested this in FreeBSD.