Welcome to LQ!!
At 2AM pacific time, please do not be in too much of a hurry. Most of the US is still asleep, and most of Europe and Asia is at work. This leaves eastern asia and cruise ships in the Atlantic.
If I remember correctly, RHEL4 does not support SATA. Maybe RHEL5 does....but, if you like RedHat, why not use Fedora? (it's free and has a lot more stuff available.)