My 500 GB SATA hard disk not detected

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http://nixcraft.com – Hello every body, Here i have problem with my 500 GB SATA HDD while i am installing RHEL5 at the time of partition my HDD is not showing the RHEL5 in the devices and giving error "No devices found" mother board ASUS 5N-MX intel chipset and HDD is SEGATE 500GB. plz give the solution thanks in advance (HowTos)