mkisofs

mkisofs -l -R -J -V SuSE91 -v -o ./suse-9.1-ftp_install.iso /mnt/hdd1/suse/

-l Allow full 31 character filenames.
-R Generate SUSP and RR records using the Rock Ridge protocol to
further describe the files on the iso9660 filesystem.
-J Generate Joliet directory records in addition to regular iso9660
file names.
-V volid
Specifies the volume ID (volume name or label) to be written
into the master block.
-v Verbose execution.
-o filename
is the name of the file to which the iso9660 filesystem image
should be written.