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 installation or an upgrade of an existing Mandrakelinux system:
Install. For the most part, this completely wipes out the old system. However, depending on your partitioning scheme, you can prevent some of your existing data (notably home directories) from being over-written. If you wish to change how your hard drives are partitioned, or to change the file system, you should use this option.
Upgrade. This installation class allows you to update the packages currently installed on your Mandrakelinux system. Your current partitioning scheme and user data won't be altered. Most of the other configuration steps remain available and are similar to a standard installation.