How to Make an ISO Image Using DD

Published: 26 Jan 2007

The basic syntax for dd is:

dd if=INPUT-FILE-NAME of=OUTPUT-FILE-NAME

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/

This results in a file called cd.iso in folder /tmp which contains all the files and directories in /tmp/directory/.