I read a lot of problems people were having, me as well, installing Fedora Core 6 on a SATA Dell Optiplex. I had a machine here at work, that had installed it previously just fine, but after a hard disk failure, and a new blank disk from Dell, I was starting from scratch.
The initial was a pain, I would go through the installer portion and it would not recognize a drive at all. The BIOS saw the drive, the on board diagnostics saw the drive, and Western Digital’s Diagnostic tools saw the drive so I knew it was there.
After trying several things I found on the web, I decided to do the opposite of one of them. I went in the BIOS and disabled compatibility mode and went to standard SATA drive operation.
I rebooted the machine and the Fedora Installer recognized the drive right away.
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