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Making your own linux boot disk !

Hi everybody ! How can i make the most simple boot disk just to able to boot the computer ? What i want is to be able to have the equivalent of a dos boot disk ? I know there is a lot of info out there but it's to fragmented  for me .So if someone can tell me all the steps in a clearer manner i will be more than happy

Thank U all
1 Solution
Karl Heinz KremerCommented:
You need two things for a Linux bootdisk that does not just boot your Linux installation on a hard disk: The Linux kernel, and a root file system. If you want to do anything with this disk, you need some programs on the root file system. Because the Linux kernel is not that small anymore, it's very unlikely that you can create one from scratch (without a lot of experience) that can do anything.

If you just want to boot the Linux installation on your hard disk, you can write the kernel image to a floppy disk. If e.g. your kernel is /boot/vmlinuz run the following command:
dd if=/boot/vmlinuz of=/dev/fd0

If you really want to learn how to create a (useful) boot disk, you should take a look at some of the floppy disk Linux systems (or small Linux systems in general). Here are some links:


I've done this myself a number of years ago (http://www.khk.net/lods/). It's fun, and you learn a lot about how things need to be packaged.

Have fun.
or try to get one from www.bootdisk.com

also have a look here http://www.experts-exchange.com/Operating_Systems/Linux/Q_20809768.html, someone have similar question as yours :-)
toxixAuthor Commented:
Hi guys thanks for the info ! i need to specify something.The goal of my question is i want to learn how to make a floppy that will be able to log to an ftp server and then from there start an installation of let say Redhat... I really want to know all the mecanics under the hood !

thanks again guys

Duncan RoeSoftware DeveloperCommented:
Usually you set up a Kickstart server and boot clients off eth0. No floppy needed.
Three disks are needed for Intel based computers: "boot.img" or "bootnet.img", "supp.img", and "modules.img". Choose "boot.img" for local installs (CD-Rom, hard drive) or "bootnet.img" for network installs (NFS, FTP, HTTP). Copy the three images to 1.44 MB floopy disks using: dd if=file.img of=/dev/fd0 bs=72k under Linux or "rawrite.exe" under DOS or Windows.

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