To make an ISO from your CD/DVD, place the media in your drive but do not mount it. If it automounts, unmount it.  
dd if=/dev/dvd of=dvd.iso    # for dvd   
dd if=/dev/cdrom of=cd.iso   # for cdrom   
dd if=/dev/scd0 of=cd.iso    # if cdrom is scsi 
To make an ISO from files on your hard drive, create a directory which holds the files you want. Then use the mkisofs command. 
mkisofs -o /tmp/cd.iso /tmp/directory/
 
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