K3b is a CD/DVD burning software comes by default with KDE when you installed Slackware. It has everything a beginner needs to burn a data, audio, video and ISO image under Linux using the graphical user interface without learning the command line utilities such as cdrecord, cdrdao, and growisofs. This is an example on how to burn ISO image using k3b dvd burner program running in Slackware Linux.

1) Insert dvd into the dvd writer. KDE will automatically detect the blank dvd that you insert and asked what you want to do with it. Choose to 'Create data dvd with k3b' and click OK. See the example k3b screenshot below:

2) The k3b program opens. Navigate the source image that you want to burn in the left pane. Choose the iso image that you want to burn from the right pane. Click and drag the iso image to the bottom pane. See the step by step instructions in screenshot example below:

3) The k3b burner program automatically detect the data/source file is an iso image file and inform us that the iso image can be burn directly to a medium. So we can choose 'Burn the image directly' to burn the iso image to the dvd.

4) The md5sum program automatically run to check the file integrity.

5) Compare the md5sum and when you are done, change the burn speed to 4x to make sure the image will be burn properly (the slower is better). Set how many copies to burn and choose to verify the burned data or not. Click Start to begin burning the iso image. See the step by step instructions in the screenshot image below:

6) A new window pops up. This window shows the burning process in real time. See example screenshot below:

Wait until the Overall process is at 100%. When k3b has finished the burning, click on Close to quit the program.

That's all.