Step 7 -->
First modprobe the module - scsi_mod
Now modprobe the modules required for your HD. I'm not sure which ones you'd require as I never owned a SATA. A guess - any module that would have "ata" in it. Some of the modules I half-remember - atii_xp, scsi_trasport_fc...... or something similar.
modprobe the module sd_mod
Ofcourse, the best way would be to boot into another linux system you might have already installed or boot with the SuSE linux CD and when it monuts your hard disk, do an lsmod and learn what modules have been loaded. Then, boot with RHES4 disc and load the same modules. I'd suggest uou wait for few seconds between the modprobes as the modules would take few momets to initalize.