Driver disk

How do I do a "Driver update" disk for installation with a hard disk driver that's not included in the distribution? Or, how do I modify the existing modules2 floppy? If I mount it, I have a file named 'module.config' and one named 'scsi-modules' where apparently all the drivers are packed in. But how can I modify that file/disk to include my updated driver? Or, as the first question is, how can I create a driver update floppy? Anders.