The mkisofs program is used as a pre-mastering program; i.e., it generates the ISO9660 filesystem. Mkisofs takes a snapshot of a given directory tree and generates a binary image of the tree which will correspond to an ISO9660 filesystem when written to a block device. Mkisofs is used for writing CD-ROMs, and includes support for creating bootable El Torito CD-ROMs.

Install the mkisofs package if you need a program for writing CD-ROMs.