DrakX usually detects your hard disks correctly. However it may fail to detect some older SCSI drive controllers and thus fail to install the required drivers and the installation may fail.

If this happens, you'll need to manually tell Drakx which SCSI drive(s) you have.

After that, DrakX should be able to figure out which parameters need to be set for the drive to work. You should only have to set them manually if DrakX doesn't manage to do it.