i have a system which has two hard disks..one is sata and the other one is normal ata hard disk.
i wish to install red hat enterprise linux WS(desktop edition) on my sata hard disk..but the installer shows me only my ata hard disk..
i searched the net..it says that a library-- libata will let it recognize my sata hard disk..but for dat i need to first install the os on my ata hdd..
is dere ne way by which i can directly install the os on my sata hdd??

I had this same problem with Gentoo. Brand-new system with SATA hard drive, and the Gentoo livecd would not see it. It is a catch-22 -- you need to upgrade your distribution to install on the system, but the system cannot even be installed on it.

I just dug an ancient 2GB PATA drive from my junkpile and bootstrapped from that -- installed on it, updated it and poked it until it saw the SATA drive, created partitions on the SATA drive, and copied all the files over.

I don't know if it'll be that easy on Redhat Enterprise. Does it have any copyprotection that'll go bananas when you copy it?

Start insatallation process with option "expert". There you can specify HDD specific driver to load. If you cannot see your device in listing there then you search on Internet for Driver Floppy disk for your redhat release.
Finally there is another more expert way of doing this. You can press Alt+F2 or Ctrl+Alt+F2 to get shell prompt on VirtualTerminal2. "cd" to /tmp. You need to extract your desired module from /modules/modules.cgz using following command

gzip -d -c modules.cgz | cpio -iud 2.6.X-X/modulename.ko

There you can try loading couple of relevent modules with command insmod ./2.6.X-X/modulename.ko.

You can search for document on internet to know more about this complex way of doing.