This step is activated only if an existing GNU/Linux partition has been found on your machine.
DrakX now needs to know if you want to perform a new install or an upgrade of an existing Mandrake Linux system:
Install: For the most part, this completely wipes out the old system. If you wish to change how your hard drives are partitioned, or change the file system, you should use this option. However, depending on your partitioning scheme, you can prevent some of your existing data from being over-written.
Upgrade: this installation class allows you to update the packages currently installed on your Mandrake Linux system. Your current partitioning scheme and user data is not altered. Most of other configuration steps remain available, similar to a standard installation.