SATA drives are not recognized with AS 4.0 since the SATA driver are not in the build until (as I hear) AS 4.0 Update 3 or AS 4.5.
I hade a similiar prooblem with a notebook and installing RHEL 4.0. The notebook has a SATA drive. The solution was upgrading to RHEL 5 that had the driver for the Intel SATA chipset.
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Installing Linux on SATA Hard Drive