dd is a perfect tool for copy a file, converting and formatting according to the operands. It can create exact CD-ROM ISO image.

This is useful for making backup as well as for hard drive installations require a working the use of ISO images.
How do I use dd command to create an ISO image?

Put CD into CDROM

Do not mount CD. Verify if cd is mounted or not with mount command:

# mount

If cd was mouted automatically unmout it with umount command:

# umount /dev/cdrom

OR

# umount /mnt/cdrom

Create CD-ROM ISO image with dd command:

# dd if=/dev/cdrom of=/tmp/cdimg1.iso

Where,

* if=/dev/cdrom: Read from /dev/cdrom (raw format)
* of=/tmp/cdimg1.iso: write to FILE cdimg1.iso i.e. create an ISO image

Now you can use cdimg1.iso for hard disk installation or as a backup copy of cd. Please note that dd command is standard UNIX command and you should able to create backup/iso image under any UNIX like operating system.
See also:

* To verify the ISO images use an md5sum program
* Extracting particular file from Linux ISO (CD image) file after installation
* How do I write CD at Debain Linux command prompt
* Splits directory into multiple with equal size for ISO burning purpose

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