Ok, so you’ve got data on ISO’s (or CDROM) you need to access all the time, for example the images of your favourite distro. You can extract the file to directories on your hard disk, or you can directly mount them as a file system!
It’s very straight forward, simply run the following command with the appropriate parameters. If you run into any problems, man is your friend. Your local Linux User Group is also always a great place to find helping hands.
mount -o loop -t iso9660 isofilename mountpoint
There are all sorts of information on file systems and CD formats at Linux.com which may be of use if you’d like to know more.