I also have the same observation. SATA hard disks and Ethernet devices are not recognized even by SL 5.3 on ASUS motherboards with nVidia chipsets. An example is M3N78-EM with NVIDIA GeForce 8300 chipset.

J S Jayakumar
Konstantin Olchanski wrote:

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On Fri, Mar 27, 2009 at 11:57:01AM -0500, Salvador Aguinaga wrote:

   Have any of you come across a system where fdisk does not recognize
   SATA (1.5TB drives)?


Absolutely yes. For example SL kernels do not know how to access SATA
on most recent ASUS AMD mobos using most recent NVidia chipsets. One
example is ASUS CrosshairII, but all recent mobos with the same chipset
have the same problem: nvidia sata and nvidia ethernet are not detected
by the SL kernels.

As solution, I run custom-built vanilla linux kernels on these machines (2.6.27).